ASSET SALE AGREEMENT
                  dated as of April 27, 1998
                        by and between
                SPECIALTY MINERALS (MICHIGAN) INC.
                           as Seller
                              and
               OGLEBAY NORTON LIMESTONE COMPANY
                            as Buyer
               
                      ASSET SALE AGREEMENT
                    -------------------------
  
     AGREEMENT made as of April 27, 1998, by and between
  SPECIALTY MINERALS (MICHIGAN) INC., a Michigan corporation
  with its principal place of business at P.O. Box 1047, Iron
  Mountain, Michigan 49801 (hereinafter, "Seller"), and OGLEBAY
  NORTON LIMESTONE COMPANY, a Michigan corporation with its
  principal  place  of business  at 1100 Superior Avenue,
  Cleveland, Ohio 44114-2598 (hereinafter, "Buyer").
  
  
                            RECITALS
                            --------
  
  Seller is the owner of certain assets consisting of three
  quarries and a processing facility and related real and
  personal property located in Mackinac and Schoolcraft
  counties in the State of Michigan, and a separate port
  facility and related real property located at River Rouge
  Dock, Wayne County, Michigan (hereinafter, the "Facilities").
  
  Seller is engaged in the quarrying, processing and sale of
  limestone, dolomite and related products at the Facilities
  (hereinafter, "Seller's Business").
  
  Buyer desires to buy, and Seller is willing to sell, the
  Facilities and the other Included Assets, as defined herein,
  all on the terms and subject to the conditions contained in
  this Agreement.
  
  Seller desires certain lime suppliers to purchase limestone
  products from Buyer following Buyer's acquisition of the
  Included Assets, and Buyer desires to sell such products to
  such lime suppliers.
  
  I. ACQUISITION OF ASSETS
    
     A.   ASSETS TO BE SOLD.
  
          On the Closing Date (as hereinafter defined), and
  otherwise on the terms and subject to the conditions
  contained in this Agreement, Seller will sell, transfer,
  assign and convey to Buyer, and Buyer will purchase and
  accept from Seller, the assets, properties and rights
  described in this Section I(A), but not including those
  assets described in Section I(B). All of said assets,
  properties and rights described in this Section I(A) are
  collectively referred to in this Agreement as the "Included
  Assets".
  
          1.   EQUIPMENT.
  
          All equipment, machinery, fixtures, patterns,
  apparatus, tools, dies, parts (including office equipment),
  jigs for parts, molds, vehicles, desks, chairs, tables, room
  dividers, typewriters, computers, computer programs
  (including program and source codes to the extent legally
  transferrable), automobiles, trucks, communication equipment,
  and other similar equipment located at the Facilities and
  owned by Seller (hereinafter, "Equipment") including without
  limitation the items set forth on Schedule I(A)(1).
  
          2.   PRODUCT INVENTORIES.
  
  All inventories of finished products, primary surge stone,
  and other work in process located at the Facilities
  (hereinafter, "Product Inventories") as set forth in Schedule
  I(A)(2).
  
          3.   GENERAL INVENTORIES.
  
  All inventories of spare parts, replacement and component
  parts, office and other supplies, goods, raw materials, and
  other materials,  located at the Facilities, excluding
  Product Inventories (hereinafter, "General Inventories") as
  set forth in Schedule I(A)(3).
  
          4.   OFFICE FILES.
  
  All files, records, books, memoranda, mining plans, computer
  printouts, databases and related items located at the
  Facilities, which are related to Seller's Business or the
  Included Assets, provided that if any such item shall be an
  integral part of any system, report, file or record of Seller
  which does not relate primarily to Seller's Business or the
  Included Assets, Seller shall have the option of delivering
  to Buyer at Closing (as hereinafter defined) copies of any
  portion of such items which are related to Seller's Business
  or the Included Assets. Specifically included hereunder,
  without limitation however, are blue prints, drawings and
  other technical papers, and inventory, maintenance, and asset
  history records and ledgers.
  
          5.   PREPAID ITEMS.
  
  Any prepaid items, deposits, bonds and escrowed amounts with
  respect to the Included Assets or Seller's Business and all
  rights in connection with such items.
  
          6.   REAL PROPERTY.
  
  All of Seller's interests in real estate, mineral leases,
  land, easements, benefits, structures and improvements
  (including docks) at the Facilities, whether owned or leased,
  as described on Schedule I(A)(6) and subject to the permitted
  exceptions described in Section II (hereinafter the "Real
  Property").  Buyer shall assume and agree to perform and
  discharge when due Seller's obligations under the executory
  portion of any matter listed on Schedule I(A)(6).  Except as
  otherwise specifically provided in this Agreement, Buyer
  shall also assume and agree to perform and discharge when due
  Seller's obligations for reclamation or restoration of the
  Real Property, whether required by federal, state or local
  law.
  
          7.   PERSONAL PROPERTY LEASES.
  
  All leasehold interests and leasehold improvements created by
  all leases of personal property used primarily in connection
  with Seller's Business or the Included Assets under which
  Seller is a lessee or lessor, as are listed on Schedule
  I(A)(7).  Except as specifically otherwise provided in this
  Agreement, Buyer shall assume and agree to perform and
  discharge when due Seller's obligations under the executory
  portion of any matter listed on Schedule I(A)(7).
  
          8.   CONTRACTS.
  
  All claims and rights of every kind and nature whatsoever
  (and benefits arising therefrom) related  to or arising
  primarily out of the Seller's Business or the Included
  Assets, including, but not limited to, customer purchase and
  sale orders, customer sales contracts, backlogs, contractual
  claims, rights and benefits, rights against suppliers (other
  than Seller and Seller's parent, subsidiary and affiliated
  companies) under warranties covering Product Inventories and
  General Inventories or Equipment, and all licenses, permits
  and operating rights related to Seller's Business, but not
  including Purchase Commitments, License and Similar
  Agreements, and Governmental Permits, to the extent they are
  legally transferable by Seller (hereinafter "Contracts"). The
  Contracts are listed on Schedule I(A)(8), and copies of all
  of the Contracts have been provided to Buyer.  Buyer shall
  assume and agree to perform and discharge when due Seller's
  obligations under the executory portion of the Contracts from
  and after the Closing Date.
  
          9.   PURCHASE COMMITMENTS.
  
  All purchase orders, contracts, quotations and bids for the
  purchase of raw materials, component parts, goods, supplies
  and other material relating to Seller's Business or the
  Included Assets (hereinafter "Purchase Commitments").  The
  Purchase Commitments are listed on Schedule I(A)(9), and
  copies of the Purchase Commitments have been provided to
  Buyer.  Buyer shall assume and agree to perform and discharge
  when due Seller's obligations under the executory portion of
  such Purchase Commitments from and after the Closing Date.
  
          10.  LICENSE AND SIMILAR AGREEMENTS.
  
  All license agreements, distribution agreements, sales
  representative agreements, service agreements supply
  agreements, franchise agreements and technical service
  agreements relating to Seller's Business or the Included
  Assets (hereinafter "License Agreements") are listed on
  Schedule I(A)(10) and copies of the License Agreements have
  been provided to Buyer.  Buyer shall assume and agree to
  perform and discharge when due Seller's obligations under the
  executory portion of such License Agreements from and after
  the Closing Date.
  
          11.  CUSTOMER LISTS.
  
  All customer lists and customer records and information
  relating to Seller's Business.
  
          12.  GOVERNMENTAL PERMITS.
  
  All governmental licenses, permits, approvals,
  authorizations, license applications, license amendment
  applications, product registrations, and the like, of every
  kind and nature, relating to Seller's Business or the
  Included Assets, used in the conduct of Seller's Business, to
  the extent their transfer is permitted by law, (hereinafter,
  "Permits").   The Permits are listed on Schedule I(A)(12),
  and copies of all Permits have been provided to Buyer.  Buyer
  shall assume and agree to perform and discharge Seller's
  obligations under the executory portion of such Permits from
  and after the Closing Date.
  
          13.  INTANGIBLE ASSETS. 
  
  All of Seller's interests in and to all registered and
  unregistered trade names, registered and unregistered
  trademarks, service marks, d/b/a names, applications and
  notices of allowances, and specifically including the names
  "Inland Lime and Stone Company" and "Port Inland"; all
  patents and patent applications; and all copyrights and
  copyright applications, in each case used by Seller primarily
  in Seller's Business, (hereinafter, "Intangible Assets"). 
  Schedule I(A)(13) sets forth all of the Intangible Assets.
  
          14.  OTHER PROPERTY. 
  
  All proprietary know-how, trade secrets, confidential
  information, process technology, inventions, processes,
  formulae, plans, drawings and blueprints used in Seller's
  Business; and all good will and Deferred Charges (as
  hereinafter defined) associated with Seller's Business.
  
     B.   EXCLUSIONS.
  
  Notwithstanding anything to the contrary herein contained,
  the Included Assets shall not include any of the items listed
  in the following portions of this Section I:
  
          1.   CASH.
  
  All cash on hand and in banks, cash equivalents and
  investments.
  
          2.   CHECKBOOKS.
  
  Seller's checkbooks and canceled checks.
  
          3.   ACCOUNTS RECEIVABLE.
  
  The accounts receivable generated in the conduct of Seller's
  Business and rights in connection therewith.
  
          4.   INSURANCE POLICIES.
        
  Insurance policies of Seller and rights in connection
  therewith.
  
          5.   INTELLECTUAL PROPERTY.
  
  Except as is provided in Sections I(A)(13) and I(C), Seller's
  name and that of its parent, subsidiaries, and affiliated
  companies, registered and unregistered trade names,
  registered and unregistered trademarks, service marks, d/b/a
  names, applications, and notices of allowances; all patents
  and patent applications; all copyrights and copyright
  applications; and all know-how, trade secrets, confidential
  information, process technology, inventions, processes,
  formulae, plans, drawings, and blue prints not used primarily
  in Seller's Business.
  
          6.   MISCELLANEOUS.
  
  Except for the properties, assets, and items listed on any
  schedule under Section I(A), any other property or asset
  which is not and has not been used primarily in the conduct
  of Seller's Business. 
  
     C.   USE OF SELLER'S NAME.
  
  Buyer acknowledges and agrees that it does not have and is
  not purchasing any rights in or to Seller's corporate name,
  "Speciality Minerals (Michigan) Inc.", or the name of any
  Affiliate (as defined in Section V(R)(1) of this Agreement)
  of Seller other than the names "Inland Lime and Stone
  Company" and "Port Inland"; and Buyer further agrees to
  obliterate any reference to Seller or Seller's name from any
  material transferred herein that will or may be viewed by
  customers, vendors or any member of the general public.  It
  is the intention of this provision that Buyer take, and Buyer
  agrees to take, all reasonable actions necessary to prevent
  customers, vendors and any member of the general public from
  associating Buyer's use of the Included Assets with Seller
  from and after the Closing Date, provided that nothing herein
  shall prevent the use of the names "Inland Lime and Stone
  Company" or "Port Inland" by Buyer.
  
     D.   METHOD OF TRANSFER.
  
  The sale of the Included Assets shall be effected by a Bill
  of Sale in substantially the form provided in Exhibit I(D)a,
  the delivery of Warranty Deeds to, and Assignments of the
  Real Property listed on Schedule I(A)(6) in substantially the
  forms provided in Exhibits I(D)b and I(D)c, respectively, and
  the execution, delivery, and recording of such documents as
  may be reasonably deemed necessary by Buyer's counsel.  All
  consents and other approvals necessary to transfer the
  Included Assets to Buyer and to permit Buyer to operate
  Seller's Business in a similar manner to that done by Seller
  prior to this Agreement shall be evidenced by such documents
  as are reasonably deemed necessary by Buyer's counsel.  Title
  to Real Property shall be determined in accordance with
  Section II.
  
     E.   ASSUMPTION OF LIABILITIES.
  
  Buyer assumes and agrees to perform and discharge when due
  Seller's obligations described in subsections 6, 7, 8, 9, 10,
  and 12 of Section I.A.  Seller shall retain responsibility
  for the payment of accounts payable relating to transactions
  occurring prior to the Closing Date.
  
  II.     TITLE AND RISK OF LOSS
  
     A.   RISK OF LOSS.
  
  Title to the assets being sold, assigned, transferred and
  conveyed hereunder shall pass to Buyer upon delivery of the
  portion of the Purchase Price (as hereinafter defined), that
  is due at Closing, on the Closing Date (as hereinafter
  defined) with the risk of loss being borne by Seller until
  such date and time, from and after which time risk of loss
  shall be borne by Buyer.
  
     B.   TITLE INSURANCE COMMITMENT.
  
  Seller has ordered a commitment for an owner's policy of
  title insurance, American Land Title Insurance ("ALTA")
  Owner's Policy Form 1992B (the "Title Commitment") from
  Chicago Title Insurance Company (the "Title Company") for
  each asset comprising a fee interest in real estate.  Copies
  of Title Commitments with respect to the Real Property
  located in Mackinac and Schoolcraft counties and with respect
  to the Real Property associated with the River Rouge Dock in
  Wayne county have been delivered to Buyer, Buyer acknowledges
  the receipt of the same, and Buyer accepts the state of title
  to the Real Property as set forth in said Title Commitments,
  subject to the title exceptions listed thereon as set forth
  on attached Schedule I(A)(6) and identified herein in Section
  V(C) as the "Permitted Encumbrances."
  
  III.    CLOSING
  
     A.   PLACE AND TIME.
  
  The closing of this transaction (hereinafter "Closing") shall
  take place at 10:00 a.m. on April 28, 1998, or on such other
  date as shall be mutually agreed between the parties in
  writing, effective as of 6:01 a.m. on April 27, 1998
  (hereinafter "Closing Date"), at the offices of Ulmer & Berne
  LLP, Buyer's counsel, at 1300 East Ninth Street, Suite 900,
  Cleveland, Ohio or at such other place as the parties hereto
  shall agree upon in writing.  If for any reason the Closing
  has not occurred by April 30, 1998, then this Agreement may
  be terminated by either party upon notice to the other party,
  and each party shall be relieved of all liability hereunder.
  
     B.   DELIVERIES AT THE CLOSING.
  
          1.   DELIVERIES BY BUYER.
  
  At the Closing, Buyer shall deliver to Seller:
  
               a.   The portion of the Purchase Price
                    deliverable at Closing.
  
                    The payment of the Purchase Price as
                    required pursuant to Article IV below.
       
               b.   Certificate of Incorporation; Bylaws.
  
                    Copies of the certificate of
  incorporation and bylaws of Buyer, certified by its Secretary
  or Assistant Secretary.
  
               c.   Certificates of Good Standing.
  
                    A certificate of good standing from the
  State of  Michigan with respect to Buyer, dated not earlier
  than 10 days prior to the Closing Date.
  
               d.   Board of Directors Resolutions.
  
                    A copy of the resolutions of Buyer's
  board of directors, approving the transactions contemplated
  herein and the execution, delivery and performance of this
  Agreement, certified by the Secretary or an Assistant
  Secretary of Buyer.
     
               e.   Incumbency Certificate.
  
                    A certificate of the Secretary or an
  Assistant Secretary of Buyer certifying the names and
  signatures of the officer or officers of Buyer who are
  authorized by Buyers board of directors to sign this
  Agreement and related documents. 
  
               f.   Opinion of Counsel.
  
                    An opinion of Ulmer & Berne LLP, counsel
  for Buyer, dated the Closing Date, in substantially the form
  attached hereto as Exhibit III (B)(1)(f).
          
               g.   Closing Certificate.
          
                    A closing certificate duly executed by
  any officer of Buyer authorized to do so, on behalf of Buyer,
  pursuant to which Buyer represents  and warrants to Seller
  that Buyer's representations and warranties to Seller are
  true and correct as of the Closing Date as if then originally
  made, that all covenants required by the terms hereof to be
  performed by Buyer on or before the Closing Date have been so
  performed, and that all documents to be executed and
  delivered by Buyer at the Closing have been executed by duly
  authorized officers of Buyer.
  
               h.   Limestone Availability Agreement.
       
                    The Limestone Availability Agreement
  referred to in Section VII(O) of this Agreement or a
  counterpart thereto fully executed  by  any officer of Buyer
  authorized to do so, on behalf of Buyer.
          
               i.   Other Documents.
          
                    Such other documents as Seller shall
  reasonably request.
  
          2.   DELIVERIES BY SELLER.
  
  At the Closing, Seller shall deliver to Buyer:
  
               a.   Transfer Documents.
  
                    The Bill of Sale, Assignments, Deeds and
  other documents required pursuant to Section I.
  
               b.   Certificate of Incorporation; Bylaws.
  
                    Copies of the certificate of
  incorporation and bylaws of Seller, certified by its
  Secretary or Assistant Secretary.
  
               c.   Certificate of Good Standing.
  
                    A certificate of good standing from the
  State of Michigan with respect to Seller, dated not earlier
  than 10 days prior to the Closing Date.
  
               d.   Board of Directors Resolutions.
  
                    A copy of the resolutions of Seller's
  board of directors, approving the transactions contemplated
  herein and the execution, delivery and performance of this
  Agreement, certified by its Secretary or an Assistant
  Secretary.
  
               e.   Incumbency Certificate.
  
                    A certificate of the Secretary or an
  Assistant Secretary of Seller certifying the names and
  signatures of the officer or officers of Seller who are
  authorized by Seller's board of directors to sign this
  Agreement and related documents.
  
               f.   Assignments and Consents.
  
                    Such assignments and consents of third
  parties or governmental entities as may reasonably be
  determined necessary or required by Buyer to transfer  the
  contracts, leases, permits and licenses and other Included
  Assets.
     
               g.   Opinion of Counsel.
          
                    An opinion of S. Garrett Gray, counsel
  for Seller, dated the Closing Date, in substantially the form
  attached hereto as Exhibit III (B)(2)(g).
          
               h.   Physical Possession.
          
                    Physical possession of all real estate
  and all tangible personal property included in the Included
  Assets.
          
               i.   Closing Certificate.
          
                    A closing certificate duly executed by
  any officer of Seller authorized to do so, on behalf of
  Seller, pursuant to which Seller represents  and warrants to
  Buyer that Seller's representations and warranties to Buyer
  are true and correct as of the Closing Date as if then
  originally made, that all covenants required by the terms
  hereof to be performed by Seller on or before the Closing
  Date have been so performed, and that all documents to be
  executed and delivered by Seller at the Closing have been
  executed by duly authorized officers of Seller.
  
               j.   Limestone Availability Agreement.
          
                    The Limestone Availability Agreement
  referred to in Section VII(O) of this Agreement or a
  counterpart thereof fully executed  by  any officer of Seller
  authorized to do so, on behalf of Seller.
          
               k.   Title Insurance.
     
                    An owner's policy of title insurance as
  described in Section II(B) of this Agreement covering the
  interests of Buyer or its nominee in the Real Property in the
  total amount of the Purchase Price (as hereinafter defined),
  allocated to the Real Property, subject only to the Permitted
  Encumbrances. 
          
               l.   Noncompetition Agreement.
  
                    A fully executed Noncompetition
  Agreement, as defined in Section VII(Q) of this Agreement.
  
               m.   Other Documents.
          
                    Such other documents as Buyer shall
  reasonably request.
  
  IV.     PURCHASE PRICE: PAYMENT
  
     A.   PURCHASE PRICE.
  
  The purchase price for the Included Assets (hereinafter,
  "Purchase Price") shall be an amount equal to the net book
  value of the Included Assets as of April 27, 1998, determined
  in accordance with accepted accounting principles as
  determined by Seller and applied on a consistent basis, which
  amount shall include the aggregate amount of all unamortized
  Deferred Charges (as defined below).
  
  As used herein, "Deferred Charges" means all costs and
  expenses incurred, including compensation and related costs,
  repairs and maintenance, and any other costs and expenses
  associated with Seller's Business during the non-operating
  period between approximately November 15, 1997 and April 6,
  1998.  For purposes of this Section, recognition of income
  and expenses shall be determined in accordance with accepted
  accounting principles as determined by Seller and applied on
  a consistent basis.
  
     B.   ADJUSTMENTS AND REIMBURSEMENTS.
  
          1.   REAL AND PERSONAL PROPERTY TAXES.
  
  Real and personal property taxes with respect to the Included
  Assets shall be prorated between Buyer and Seller as of the
  Closing Date based upon the most recent available tax
  duplicate, using the due date method of proration in which
  tax bills for the current year shall be deemed payable in
  advance.
  
          2.   DOCUMENTARY TRANSFER TAXES.
  
  Buyer and Seller shall share equally in the cost of all
  Documentary Transfer taxes, real estate transfer taxes and
  conveyance fees, if any, with respect to the sale of the
  Included Assets.
  
          3.   TITLE INSURANCE.
  
  Seller shall be responsible for the cost of the title
  examination and the Title Commitment covering Buyer's
  interest in the Real Property to be furnished as provided in
  this Agreement, and Buyer shall be responsible for the cost
  of the title insurance premiums.
  
          4.   HART-SCOTT-RODINO FILING.
  
  Buyer and Seller shall share equally in the cost of all
  filing or other fees required to satisfy the requirements of
  the Hart-Scott-Rodino Anti-Trust Improvements Act.
  
     C.   PAYMENTS AT CLOSING.
  
          1.   ESTIMATED PURCHASE PRICE.
  
  At the Closing, Buyer shall pay to Seller an amount equal to
  the net book value of the Included Assets as of March 29,
  1998, determined in accordance with accepted accounting
  principles as determined by Seller and applied on a
  consistent basis, which amount shall include all Deferred
  Charges (hereinafter Estimated Purchase Price"), less the
  Deferred Charges incurred by Seller between December 29, 1997
  and April 6, 1998 (the Deferred Purchase Price"), by wire
  transfer to an account designated by Seller.
  
          2.   DEFERRED PURCHASE PRICE.
  
  At the Closing, Buyer shall pay an amount equal to the
  Deferred Purchase Price into an escrow account with Key Bank
  N.A. (the Escrow Agent) by wire transfer pursuant to an
  escrow agreement in the form attached hereto as Exhibit
  IV(C)(2) (the Escrow Agreement").
  
          3.   OTHER COSTS AND EXPENSES.
  
  At the Closing, Seller and Buyer shall pay and/or reimburse
  each other or the Title Company for the amounts required to
  be paid or reimbursed pursuant to Section IV(B) of this
  Agreement.
  
     D.   POST-CLOSING PAYMENTS.
  
          1.   DETERMINATION OF AMOUNT.
  
  Within seven (7) days after the Closing Seller shall deliver
  to Buyer a written notice (Seller's Notice") which sets forth
  the aggregate amount of the Purchase Price, as determined by
  Seller in accordance with Section IV(A) of this Agreement,
  together with the workpapers and other documentation used or
  relied upon by Seller in calculating the Purchase Price.
  Within seven (7) days after the receipt of Seller's Notice,
  Buyer shall deliver to Seller a written notice (Buyer's
  Notice") which sets forth Buyer's objections, if any, to
  Seller's determination of the Purchase Price.  If Buyer does
  not object to the Purchase Price so determined by Seller, or
  if Buyer fails to deliver a Buyer's Notice to Seller within
  such seven (7) day period, then the Purchase Price, as
  determined by Seller, shall be final and binding upon the
  parties.  If Buyer delivers a Buyer's Notice to Seller within
  such seven (7) day period objecting to the Purchase Price
  determined by Seller, the parties shall use their best
  efforts to resolve any disputes with respect to the
  determination of the Purchase Price through good faith
  negotiations.  If such negotiations have not resulted in an
  agreement between the parties with respect to the aggregate
  amount of the Purchase Price within thirty (30) days after
  the Closing Date, an independent certified public accounting
  firm designated by Buyer and reasonably acceptable to Seller
  (the "Independent Accountants") shall determine the Purchase
  Price based upon the provisions of this Agreement.  Buyer and
  Seller shall cooperate fully with the Independent Accountants
  and shall share equally in all costs and expenses of the
  Independent Accountants.  The Purchase Price so determined by
  the Independent Accountants shall be final and binding upon
  the parties.
  
          2.   PAYMENT OF BALANCE DUE.
  
  If the Purchase Price, as finally determined in accordance
  with Section IV(D)(1) of this Agreement, is greater than the
  Estimated Purchase Price, Buyer shall pay Seller an amount
  equal to the difference between the Estimated Purchase Price
  and the Purchase Price as finally determined, which amount
  shall be paid by wire transfer to an account designated by
  Seller within three (3) business days after the final
  determination of the Purchase Price pursuant to Section
  IV(D)(1) of this Agreement.  If the Purchase Price, as
  finally determined in accordance with Section IV(D)(1) of
  this Agreement, is less than the Estimated Purchase Price,
  Seller shall pay Buyer an amount equal to the difference
  between the Estimated Purchase Price and the Purchase Price
  as finally determined, which amount shall be paid by wire
  transfer to an account designated by Buyer within three (3)
  business days after the final determination of the Purchase
  Price pursuant to Section IV(D)(1) of this Agreement.
  
          3.   THIRD-PARTY PAYMENTS AFTER CLOSING.
  
  Seller shall remain entitled to the benefit of any assets
  described in Section I(B), and to the extent that Buyer
  receives on or after the Closing Date payment on account of
  any such assets, Buyer shall hold the same in trust for
  Seller and shall pay over such payment and account therefor
  to Seller within five business days of receipt thereof.  To
  the extent that Seller received on or after the Closing Date
  payment on account of the business or assets sold hereunder
  in relation to the period after the Closing Date, Seller
  shall hold the same in trust for Buyer and shall pay over
  such payment and account therefor to Buyer within five (5)
  business days of receipt thereof.
  
  V. REPRESENTATIONS AND WARRANTIES OF SELLER
  
  The term "Disclosure Schedule" as used in his Agreement means
  the Disclosure Schedule delivered by Seller to Buyer
  concurrently with the execution and delivery of this
  Agreement.   Except as set forth in the Disclosure Schedule,
  Seller represents and warrants to Buyer that, as of the date
  of this Agreement and on the Closing Date:
  
     A.   DUE INCORPORATION.
  
  Seller is a corporation duly organized, validly existing and
  in good standing under the laws of the State of Michigan and
  has all requisite corporate power and authority to own or
  lease the Included Assets in the places where such assets are
  now owned or leased. Seller has all necessary corporate power
  sufficient to enable it to enter into, perform, and carry out
  the transactions contemplated by this Agreement.
  
     B.   AUTHORIZATION.
  
  No authorization or approval or other action by, and no
  notice to or filing with, any governmental authority or
  regulatory body is required for the due execution, delivery
  and performance of this Agreement, other than the 
  Hart-Scott-Rodino filing referred to in Section VII(M) of this
  Agreement.
  
     C.   TITLE.
  
  Seller has, and will convey to Buyer or its nominee, good and
  marketable title in fee simple to the Real Property (other
  than leased Real Property), free and clear of all interests,
  claims, liens and encumbrances, with no title defects
  whatsoever other than Permitted Encumbrances.  Seller has the
  corporate power and authority to sell, transfer, assign or
  convey, as the case may be, such Real Property.  As used in
  this Agreement, "Permitted Encumbrances" means:  those
  matters listed on Schedule I(A)(6); zoning, building or other
  restrictions, variances, easements and rights-of-way, none of
  which, individually or in the aggregate:  (A) interfere with
  or impair in any material respect the present use of the Real
  Property, (B) have more than an insignificant effect on the
  value thereof or its present use, or (C) would impair the
  ability of Buyer to sell the Real Property for its present
  use; and taxes on Real Property not yet due and payable. 
  Seller has, and will convey to Buyer or its nominee, good and
  marketable title to, and has the corporate power and
  authority to sell, transfer, assign or convey, as the case
  may be, the Included Assets (other than owned Real Property),
  free and clear of all liens, leases, pledges, charges,
  claims, encumbrances, security interests and equities.  As of
  the Closing Date, there will be no mortgage, trust deed,
  chattel mortgage, conditional sale agreement, security
  agreement, financing statement or other instrument
  encumbering any of the Included Assets except for Permitted
  Encumbrances.  There are no contracts, restrictions, liens,
  claims or encumbrances which will prevent Seller from giving
  to Buyer possession of the Included Assets or which will
  limit in any way Buyer's ability, in accordance with its
  ownership interest, to use, sell, or in any way handle, use
  or dispose of said assets.
  
     D.   LIMESTONE AND DOLOMITE RESERVES.
  
  To the best of Seller's knowledge, the written information
  with respect to Limestone and Dolomite reserves attached
  hereto as Exhibit V(D) is a reasonable estimate of such
  reserves located on or under the Real Property and to which a
  fee interest, leasehold interest, mineral right, or other
  right of exploitation in good standing will be transferred to
  Buyer as provided in this Agreement.
  
     E.   ALL MATERIAL ASSETS INCLUDED.
  
  There are no material assets or properties that were used in
  Seller's Business other than those described in the schedules
  to this Agreement or conveyed to Buyer under this Agreement. 
  Seller has set forth in the Disclosure Schedule a list of all
  software program and source codes, all claims and rights
  arising out of or related to customer purchase and sales
  orders, customer sales contracts, backlogs, contractual
  claims, rights  and benefits, rights against suppliers under
  warranties covering Product Inventories and General
  Inventories or equipment, and has set forth in Schedule
  I(A)(12) all governmental licenses, permits, approvals,
  authorizations, license applications, license amendment
  applications, operating rights and product registration,
  which in each case relate to Seller's Business or the
  Included Assets but which are not legally transferable by
  Seller or any Affiliate (as hereinafter defined) of Seller
  (collectively the "Nontransferable Assets").  Seller shall
  use reasonable efforts to make the Nontransferable Assets
  available for use by Buyer in connection with the operation
  of Seller's Business by Buyer from and after the Closing Date
  for no additional consideration if so requested by Buyer.
  
     F.   CONDITION OF ASSETS.
  
  To the best of Seller's knowledge, the plants, structures,
  equipment and other items of personal property owned by
  Seller which are part of the Included Assets are structurally
  sound with no material defects, are in good and safe
  operating condition and repair, and are adequate in all
  material respects for the uses to which they are being put,
  normal wear and tear excepted.
  
     G.   CERTAIN CLAIMS.
  
  To the best of Seller's knowledge, there are no facts which,
  if known by a potential claimant or governmental authority,
  would give rise to a claim or proceeding of any kind or
  nature whatsoever which, if asserted or conducted with
  results unfavorable to Seller, would have a material adverse
  effect on the Included Assets or Buyer's ability to operate
  Seller's Business in a similar manner as that conducted by
  Seller immediately prior to this Agreement.
  
     H.   CERTAIN VIOLATIONS OR PROCEEDINGS.
  
  There is no litigation or proceeding, in law or in equity,
  and there are no proceedings or governmental investigations
  before any commission or other administrative authority,
  pending or to the best of Seller's knowledge threatened
  against Seller with respect to or affecting Seller's Business
  or the Included Assets, or the consummation of the
  transactions herein contemplated, or the use of the Included
  Assets (whether by Buyer after the Closing or by Seller prior
  thereto) in a manner similar to that conducted by Seller
  immediately prior to this Agreement.  Seller's operation and
  management of Seller's Business, and the Included Assets, are
  in compliance in all material respects with all applicable
  orders, laws, ordinances, codes, regulations or other
  requirements of any governmental authority, including,
  without limitation, those relating to environmental
  protection, civil rights, occupational safety and health,
  mining and zoning, building and use requirements.
  
     I.   CERTAIN CONTRACTS, PERMITS AND LICENSES.
  
  All contracts, agreements, leases, warranty agreements,
  mineral leases and all licenses, Permits and governmental
  approvals and intangible assets listed on Schedule I(A)(6),
  Schedule I(A)(7), Schedule I(A)(8), Schedule I(A)(9),
  Schedule I(A)(10), Schedule I(A) (12), and Schedule I(A)(13)
  are in full force and effect and are, except as otherwise
  indicated on those Schedules, freely transferrable to Buyer
  or its nominee without the consent or approval of any third
  party.  There are no defaults, breaches or violations of or
  with respect to any such documents, and, to the best of
  Seller's knowledge, no event, occurrence or condition has
  occurred (or is threatened to occur) which, with the lapse of
  time, the giving of notice, or the happening of any further
  event or condition, or both would become a default or
  violation of any such document.  Seller is not bound by, and
  Buyer is not assuming, any commitment for the delivery of any
  of its products, including the Limestone Availability
  Agreement identified in Section VII(O), aggregating in excess
  of what can be delivered out of present inventories plus
  future production at current practicable capacity during the
  time available to satisfy such commitments.  There are no
  occupancy, sanitary district, water, sewage, air,
  environmental protection agency, natural resource department
  or other licenses or permits required by any federal, state,
  regional or local governmental authority for the ownership,
  use or operation of the Included Assets by Buyer in the
  conduct of Seller's Business.   To the best of Seller's
  knowledge, all Permits are in full force and effect, validly
  issued, and without violations on the part of Seller or its
  affiliates.
  
     J.   NO MATERIAL LOSS.
  
  Since January 1, 1997, Seller has not suffered or been
  threatened with any material loss of any Included Assets and
  has not entered into any material transaction related to the
  Included Assets. 
  
     K.   BROKERS.
  
  Other than as set forth in the Disclosure Schedule, Seller
  has not engaged any broker or finder in connection with the
  transaction contemplated herein, and Seller hereby agrees to
  indemnify and hold harmless Buyer against the claims of any
  broker or finder engaged by Seller.
  
     L.   INSURANCE.
  
  Seller will maintain in full force and effect through the
  Closing Date all insurance coverage which it presently
  carries on Seller's Business and the Included Assets.
  
     M.   ENVIRONMENTAL AND RECLAMATION LAWS.
  
          1.   DEFINITIONS.  As used in this Agreement, the
  following terms shall have the meanings indicated below:
  
               a.   Applicable Permit.  Any permit, license
  or document issued at or prior to the Closing Date that is
  necessary for Seller to do business in connection with
  Seller's Business in each of the jurisdictions in which it is
  qualified or authorized to do business.
  
               b.   CERCLA.  The Comprehensive Environmental
  Response, Compensation and Liability Act of 1980, 42
  U.S.C.Section 9601 et seq., as amended.
  
                c.  Claims.  All liens, encumbrances,
  security interests, mortgages, equities, options or pledges
  of every kind, nature and description.
  
               d.   Governmental Authority.  Any national,
  state or local government (whether domestic or foreign) and
  any political subdivision thereof or any other governmental,
  quasi-governmental, judicial, public or statutory
  instrumentality, authority, body, agency, bureau or entity,
  including, without limitation, any court, zoning authority,
  building inspector, or any arbitrator with authority to bind
  a party at law.
  
               e.   Hazardous Substances.  Any "hazardous
  substance," as defined in Section 101(14) of CERCLA; any
  "hazardous waste" as defined by Section 1004(5) of the
  Resource Conservation and Recovery Act, 42 U.S.C.Section 6901
  et seq. RCRA; any radioactive material (including "byproduct
  material," "depleted uranium," "source material," or "special
  nuclear material") as defined by The Atomic Energy Act, 42
  U.S.C. Section 2011 and 10 C.F.R. Section 40.4; any
  "hazardous chemicals" as defined by 29 C.F.R. Section
  190.1200 et seq. any "toxic pollutant," as listed pursuant to
  Section 307 of the Federal Water Pollution Control Act, 33
  U.S.C. Section 1251 et seq. any "hazardous air pollutant" as
  listed under Section 112 of the Clean Air Act, 42 Section
  7401 et seq., any oil as defined in The Oil Pollution Act of
  1990, 33 Section 2701 et seq. and any other material
  regulated by any state statute which is equivalent or
  comparable to the foregoing.
  
          2.   OPERATIONS IN COMPLIANCE.     The operations
  of the Seller's Business are in compliance, in all material
  respects, with all statutes, laws, ordinances, rules,
  regulations, judgments, orders and decrees, which are
  presently in effect and which are applicable to the Seller's
  Business.  These include, without limitation, laws relating
  to the protection of the environment, including laws relating
  to emissions, discharges, releases or threatened releases of
  pollutants, contaminants or hazardous or toxic materials or
  wastes, contaminated air, surface water, ground water, or
  land, or otherwise relating to the manufacture, processing,
  distribution, use, treatment, storage, disposal, transport or
  handling of pollutants, contaminants or Hazardous Substances.
  
          3.   NO VIOLATIONS.  There are no outstanding
  notices of violation, Claims, citations, complaints, penalty
  assessments, suits or other proceedings, administrative,
  civil or criminal, at law or in equity, pending or, to
  Seller's knowledge, threatened against the Seller by or
  before any governmental authority with respect to Seller's
  Business.  No investigation or review is pending or, to
  Seller's knowledge, threatened against Seller by or before
  any governmental authority with respect to any alleged
  violation of any Applicable Permit, law, regulation,
  ordinance, standard or order relating to Seller's Business. 
  Seller has received no notices stating that any third party
  intends to file suit under any environmental statute with
  respect to Seller's Business.  All Hazardous Substances and
  Solid Wastes (as defined in RCRA, 42 U.S.C. Section 6903(27))
  of Seller's Business have been transported and disposed of in
  compliance with all applicable laws and Applicable Permits. 
  Seller has no knowledge that any Hazardous Substances have
  ever been released, discharged or disposed of on or about the
  Facilities, other than incidents or matters which have been
  fully resolved under all applicable laws and regulations.
  
          4.   WASTE DISPOSAL.  Seller has not received from
  any Governmental Authority or third party any request for
  information, notice of Claim, demand letter, citizen suit
  notice or other notification to the effect that Seller may be
  potentially responsible with respect to any investigation or
  clean-up of Hazardous Substances released or Solid Wastes
  disposed of at any site pertaining to Seller's Business.  To
  Seller's knowledge, no Hazardous Substances or Solid Wastes
  generated by Seller from the Facilities have been sent,
  directly or indirectly, to any site listed or formally
  proposed for listing on the National Priority List
  promulgated pursuant to CERCLA, or to any site listed on any
  state list of hazardous substance sites requiring
  investigation or cleanup.
  
          5.   UNDERGROUND STORAGE TANKS.  All underground
  storage tanks previously located on Facilities currently
  occupied by Seller have been closed in place or removed in
  compliance with all applicable laws and regulations.
  
          6.   NO PCB'S.  No electrical, heat transfer or
  hydraulic equipment or other equipment containing
  polychlorinated biphenyl at levels of regulatory concern is
  located on any real property currently leased or occupied by
  Seller. 
  
          7.   HAZARDOUS SUBSTANCES.  None of the Facilities
  and, to Seller's knowledge, none of the properties leased
  and/or operated by Seller in connection with Seller's
  Business, is contaminated by or contains any Hazardous
  Substance.  Neither Seller nor any Affiliate of Seller has
  ever applied for "Interim Status" for the Facilities under 42
  U.S.C.Section 6925(e), and regulations enacted thereunder,
  nor are the Facilities subject to the treatment, storage and
  disposal regulations promulgated by any Governmental
  Authority under RCRA.
  
          8.   ASBESTOS.  Seller has not been notified that
  any claim has been made against Seller with respect to any of
  the Facilities currently occupied by Seller resulting from
  any asbestos or similar materials used in the construction
  thereof.
  
     N.   EXECUTION, DELIVERY, AND PERFORMANCE OF AGREEMENT.
  
  Neither the execution, delivery nor performance of this
  Agreement by Seller will, with or without the giving of
  notice or the passage of time, or both, conflict with, result
  in a default, right to accelerate or loss of rights under, or
  result in the creation of any lien, charge or encumbrance
  pursuant to, any provision of Seller's certificate of
  incorporation or by-laws or any franchise, mortgage, deed of
  trust, lease, license, agreement, understanding, law, rule,
  or regulation or any order, judgment or decree to which
  Seller is a party or by which Seller or the Included Assets
  may be bound or affected. This Agreement has been duly
  executed and delivered by Seller and constitutes the legal,
  valid and binding obligation of Seller, enforceable against
  Seller in accordance with its terms, except as enforcement
  may be affected by bankruptcy, moratorium or similar laws for
  the benefit of creditors generally, and subject to the
  availability of equitable relief.
  
     O.   PRODUCT INVENTORIES
  
  Except as specifically set forth in the Disclosure Schedule,
  no material portion of the Product Inventories consists of
  items which are not merchantable or which are not suitable
  and usable for the production or completion of merchantable
  products for sale within a reasonable period of time in the
  ordinary course of Seller's Business as first quality goods
  at normal mark-ups, or if required to be fit for any
  particular purpose of customers of Seller's Business, are so
  fit, and no material portion of the Product Inventories
  consists of any items which are slow-moving, obsolete, or of
  below-standard quality.  The quantities of all lines of
  Product Inventories are reasonable and appropriate in the
  present circumstances of Seller's Business.  The inventories
  of primary surge stone and other work in process which
  constitute part of the Product Inventories on hand on the
  date of this Agreement and on the Closing Date are and will
  be sufficient to satisfy the normal business needs therefor
  of Seller's Business as of the date of this Agreement and of
  the Closing Date, respectively, in a manner consistent with
  the historical practices of Seller's Business.
  
     P.   DOCKS
  
  The docks and dock faces which constitute part of the
  Facilities are in a safe and operable condition which will
  permit self-unloading bulk vessels of the type which
  customarily use the dock to safely reach the dock and remain
  afloat.  As of the Closing Date, the underwater areas
  adjacent to and leading to the docks which constitute part of
  the Facilities are adequately dredged by Seller at Port
  Inland and by the Corps of Engineers at Rouge dock to permit
  such self-unloading bulk vessels to safely reach, tie up next
  to, load to midsummer draft, and depart the Port Inland dock,
  and to safely reach, tie up next to, discharge cargo, and
  depart the Rouge dock in Detroit.
  
     Q.   INCLUDED ASSETS SUFFICIENT TO OPERATE SELLER'S
  BUSINESS
  
  All Included Assets, including mobile mine equipment and
  processing plant facilities, are in a condition which will
  permit Buyer to operate Seller's Business in a manner similar
  to that as operated by Seller prior to the date of this
  Agreement, reasonable wear and tear excepted.  The Included
  Assets, when taken as a whole, are suitable and sufficient to
  operate Seller's Business in a manner similar to that
  conducted by Seller immediately prior to the date of this
  Agreement.
  
     R.   ERISA AND LABOR LAW COMPLIANCE
  
          1.   DEFINITIONS.   As used in this Agreement, the
  following terms shall have the meanings indicated below:
  
               a.   Affiliate.  The term "Affiliate" shall
  include a corporation, which is a member of a controlled
  group of corporations with Seller within the meaning of
  Section 414(b) of the Code, or a trade or business (including
  a sole proprietorship, partnership, trust, estate or
  corporation) which is under Common Control with Seller within
  the meaning of Section 414(c) of the Code, or any entity
  which is a member of an affiliated service group within the
  meaning of Section 414(m) or (o) of the Code with Seller.
  
               b.   Code.  The Internal Revenue Code of 1986,
  as amended.  Reference to a specific Section of the Code
  shall include any regulation promulgated thereunder.
  
               c.   ERISA.  The Employee Retirement Income
  Security Act of 1974, as amended.
  
               d.   ERISA Plan.  Any ERISA Pension Plan and
  any ERISA Welfare Plan, regardless of whether such plan is
  tax qualified pursuant to Section 401 of the Code, including
  all employee benefit plans as defined in Section 3(3) of
  ERISA, and all bonus, stock option, stock purchase,
  incentive, deferred compensation, supplemental retirement,
  severance and other similar fringe or employee benefit plans,
  programs or arrangements, including all obligations,
  arrangements or customary practices, whether or not legally
  enforceable, to provide benefits other than salary or
  compensation for services rendered, to present or former
  directors, employees or agents of Seller or any Affiliate of
  Seller.
  
               e.   ERISA Pension Plan.  Any employee pension
  benefit plan as defined in Section 3(2) of ERISA which has
  been or is established or maintained by Seller or an
  Affiliate of Seller.
  
               f.   ERISA Welfare Plan.  Any employee welfare
  benefit plan as defined in Section 3(1) of ERISA which has
  been or is established or maintained by Seller or an
  Affiliate.
  
               g.   Governmental Authority.  Any national,
  state or local government (whether domestic or foreign) and
  any political subdivision thereof or any other governmental,
  quasi-governmental, judicial, public or statutory
  instrumentality, authority, body, agency, bureau or entity,
  including, without limitation, any court, zoning authority,
  building inspector, or any arbitrator with authority to bind
  a party at law.
  
               h.   Multi-Employer Plan.  Any plan as defined
  in Section 3(37) of ERISA to which Seller or any Affiliate
  has or has had an obligation to contribute, and for purposes
  hereof, shall include (i) a plan to which the provisions of
  Section 413(c) of the Code or Sections 4063 or 4064 of ERISA
  apply, and (ii) any union's sponsored welfare plan to which
  Seller or any Affiliate contributes.
  
               i.   Person.  Any natural person, corporation,
  partnership, firm, association, Governmental Authority or any
  other entity, whether acting in an individual, fiduciary or
  other capacity.
  
  
          2.   ERISA MULTIEMPLOYER PLANS.  Neither Seller nor
  any Affiliate is now or has ever been, a contributing
  employer to a Multiemployer Plan.
  
          3.   PROVISIONS APPLICABLE TO ERISA PLANS OTHER
  THAN MULTIEMPLOYER PLANS.  
  
               a.   Except as otherwise agreed to in writing
  by the Seller and Buyer, Seller shall retain all of the
  liabilities and obligations arising under any ERISA Plans
  including, without limitation, any obligation with respect to
  any Employees or former Employees of Seller or an affiliate,
  or any of such person's spouses, children, other dependants
  or beneficiaries.  Buyer shall not assume or have any
  responsibility relating to any ERISA Plan maintained by
  Seller.
  
               b.   Seller shall pay any claims with respect
  to occurrences arising prior to the Closing Date relating to
  (i) medical and dental benefits to the extent covered by the
  ERISA Plans and (ii) workers' compensation benefits when the
  same become due and payable, whether prior to or after the
  Closing Date.  Seller shall be solely responsible for any
  retiree medical liabilities and related costs of medical and
  life insurance for persons who shall have retired from Seller
  or an Affiliate on or prior to the Closing Date.  Seller
  shall be responsible for employee benefit claims of Employees
  (or their eligible dependents) with respect to Claim Events
  occurring prior to the Closing Date, and to the extent that
  Buyer implements benefit plans for Employees, Buyer shall be
  responsible for such claims with respect to Claim Events
  occurring on and after the Closing Date.  A Claim Event shall
  be defined as the illness or injury giving rise to a claim of
  the nature referred to in this Section V(R)(3)(b).
  
          4.   COBRA.  Seller shall offer to all of its
  employees at the time of Closing the right to continue their
  coverage under Seller's or an Affiliate's group health
  plan(s), such offer to be made in accordance with the
  continuation coverage requirement of part b of Subtitle B of
  Title I of ERISA and Section 4980B of the Code.
  
     S.   INTANGIBLE ASSETS.
  
  Schedule I(A)(13) sets forth a complete and accurate list and
  description of all of Seller's Intangible Assets. The
  Intangible Assets are free of any liens, claims or
  encumbrances and consist of all such rights used by Seller to
  conduct Seller's Business as currently being conducted.  To
  the best of Seller's knowledge, none of the Intangible Assets
  conflict with or have been alleged to conflict with or
  infringe the patents, trademarks, trade names, service marks,
  copyrights or other rights of any third party.  Seller has no
  knowledge of any use of any of the Intangible Assets by any
  third party.  All trademarks, trade names, service marks,
  d/b/a names, patents and patent applications, and copyrights
  and copyright applications which have been used by Seller in
  connection with Seller's Business but which are not included
  in the Intangible Assets are described in the Disclosure
  Schedule.
  
     T.   BOUNDARY LINES.
  
  There is no pending litigation or dispute concerning the
  location of the lines and corners of the Real Property, and
  the improvements constructed on the Real Property are
  entirely within the boundary lines of the Real Property.
  
     U.   NOTICE OF CONDEMNATION.
  
  Seller has not received notice of, nor is Seller aware of,
  any pending, threatened or contemplated action by any
  governmental authority having the power of eminent domain,
  which might result in any part of the Real Property being
  taken by condemnation or conveyed in lieu thereof.  Seller
  shall, promptly upon receiving any such notice or learning of
  any such contemplated or threatened action, give Buyer
  written notice thereof.
  
     V.   ASSESSMENTS.
  
  No assessments have been made against any portion of the Real
  Property which are unpaid (except ad valorem taxes for the
  current year which are not yet due and payable), whether or
  not they have become liens; Seller has received no notice of,
  and Seller is not aware of, any reassessment of the Real
  Property or any portion thereof; and Seller shall notify
  Buyer upon learning of any such assessments or reassessments.
  
     W.   UTILITIES.
  
  Those public utilities (including water, electricity, gas,
  sanitary sewage, storm water drainage facilities, and
  telephone utilities) sufficient to operate the Real Property
  for its current uses are available to the Real Property and
  are completed on the Real Property and, as may be
  appropriate, are connected to the improvements.  Seller has
  not received any notice of, nor is Seller aware of, any
  pending, threatened or contemplated action by any
  governmental authority having jurisdiction or by any other
  person or entity seeking to restrict access of such public
  utilities to the Real Property or the Facilities or to
  increase the cost of such access.
  
     X.   GOOD MINING PRACTICES
  
  Seller conducts its operation of Seller's Business
  substantially in accordance with good mining practices and
  all applicable local state and federal laws and regulations
  governing its operation, including, but not limited to:
  
          1.   Maintaining all existing means of ingress,
  egress and dock facilities and such other roads, bridges,
  fire overlooks, water and communication systems, as an
  orderly mining development may require.
  
          2.   Taking all necessary precautions against
  property loss and danger to lives from floods and water
  runoffs, installing and maintaining reasonable drainage
  courses, culverts and storage dams as may be warranted or
  otherwise required by all appropriate governmental
  requirements.
  
          3.   Maintaining on the real property all safety
  systems and facilities (and which are included as a part of
  the Included Assets) necessary for the operation of Seller's
  Business.
  
          4.   Developing and maintaining such natural on-site 
  water resources and water rights of the Real Property as
  are reasonable and sufficient to operate Seller's Business in
  a manner substantially equivalent to that conducted by Seller
  prior to Closing.
  
          5.   Carrying on a reasonable drilling, exploration
  and sampling program designed to not detract from the
  economic useful life of the mining operation and its mine.
  
          6.   Filing with all appropriate governmental
  agencies all required permit applications, notices of intent
  to mine, mining plans, and all reports of Seller's activities
  during its conduct of Seller's Business.
  
          7.   Consistently maintaining an ongoing program to
  mine, process and ship the known reserve deposits of minerals
  on the Real Property with the personnel and appropriate
  equipment needed on the Real Property for the efficient
  conduct of such activities.
  
          8.   Substantially complying with all health,
  safety and antipollution regulations of all federal, state,
  regional and local agencies and carrying adequate worker's
  compensation for its operation.
  
          9.   Maintaining proper records of all mineral
  production and sales of minerals and other products from
  Seller's operation of Seller's Business, logs of drilling,
  sampling, maps of proven and indicated reserves, mine
  workings, rods and watercourses, and maps of lands to be
  reclaimed and restored as required by good mining practices
  and mining or environmental permits governing Seller's
  Business.
  
          Y.   FINANCIAL STATEMENTS.
  
  Seller has delivered to Buyer copies of financial
  information, including income statements and statements of
  assets, with respect to Seller's Business for the fiscal
  years ended December 31, 1995, 1996 and 1997 and for the
  three months ended March 29, 1998, together with the
  certificate of Seller's Treasurer with respect thereto (the
  "Financial Statements"). The Financial Statements have been
  prepared internally by Seller or by an Affiliate of Seller in
  accordance with accepted accounting principles as determined
  by Seller or an Affiliate of Seller and applied on a
  consistent basis and present fairly the financial position
  and results of operations of Seller's Business at each such
  date.  There has been no change in accounting procedures or
  methods, or in the method of valuing inventories respecting
  Seller's Business, during the period covered by the Financial
  Statements.
  
     Z.   WETLANDS.
  
  Seller has filed an application with the State of Michigan,
  Department of Environmental Quality, for a permit pursuant to
  Part 303 of Michigan's Natural Resources and Environmental
  Protection Act in connection with Seller's proposed five-year
  mining plan, and such application is currently pending before
  the State.
  
     AA.  DISCLOSURE.
  
  No representation, warranty or other statement made by Seller
  in this Agreement and no statement in the Disclosure Schedule
  contains an untrue statement of material fact or omits to
  state a material fact necessary to make the statements in
  this Agreement and in the Disclosure Schedule, in the light
  of the circumstances in which they were made, not misleading. 
  Seller does not have knowledge of any fact that has specific
  application to Seller's Business (other than general economic
  or industry conditions) and that, as far as any officer or
  director of Seller or any Affiliate of Seller can reasonably
  foresee, materially threatens the Included Assets or the
  prospects of Seller's Business that has not been set forth in
  this Agreement or the Disclosure Schedule.
  
  VI.     REPRESENTATIONS AND WARRANTIES OF BUYER
  
     Except as set forth in the Disclosure Schedule, Buyer
  represents and warrants to Seller that, as of the date of
  this Agreement and on the Closing Date: 
  
     A.   CORPORATE ORGANIZATION.
  
  Buyer is a corporation duly organized, validly existing and
  in good standing under the laws of the state of its
  incorporation with corporate power and authority sufficient
  to enable it to carry out this Agreement. Buyer has the power
  and authority to own properties and carry on business. As of
  the Closing Date Buyer will be duly qualified to do business
  in the State of Michigan. The execution, delivery and
  performance of this Agreement have been duly authorized by
  all necessary corporate action of Buyer.
  
     B.   AUTHORIZATION.
  
  No authorization or approval or other action by, and no
  notice to or filing with, any governmental authority or
  regulatory body is required for the due execution, delivery
  and performance of this Agreement other than the 
  Hart-Scott-Rodino filing referred to in Section VII(M) of this
  Agreement.
          
     C.   BROKERS
               
  Buyer has not engaged any broker or finder in connection with
  the transactions contemplated herein.
  
     D.   CERTAIN PROCEEDINGS.
  
  There is no litigation or proceeding, in law or in equity,
  and there are no proceedings or governmental investigations
  before any commission or other administrative authority,
  pending or to Buyer's knowledge threatened against Buyer with
  respect to or affecting the consummation of the transactions
  herein contemplated, or the use of the Included Assets by
  Buyer after the Closing.
  
     E.   EXECUTION,  DELIVERY AND PERFORMANCE OF AGREEMENT.
  
  Neither the execution, delivery nor performance of this
  Agreement by Buyer will, with or without the giving of notice
  or the passage of time, or both, conflict with, result in a
  default, right to accelerate or loss of rights under, or
  result in the creation of any lien, charge or encumbrance
  pursuant to, any provision of Buyer's certificate of
  incorporation or bylaws or any franchise, mortgage, deed or
  trust,  lease, license, agreement, understanding, law, rule
  or regulation or any order, judgment or decree to which Buyer
  is a party or by which Buyer may be bound or affected. This
  Agreement has been duly executed and delivered by Buyer and
  constitutes the legal, valid and binding obligation of Buyer,
  enforceable against Buyer in accordance with its terms,
  except as enforcement may be affected by bankruptcy,
  moratorium or similar laws for the benefit of creditors
  generally, and subject to the availability of equitable
  relief.
  
  VII.    COVENANTS
  
     A.   CONSENTS.
  
  Seller and Buyer shall cooperate to obtain any consent or
  governmental approval with respect to the assignment of, or
  shall make alternate arrangements reasonably satisfactory to
  Buyer with respect to, any contract, lease, license or Permit
  which is to be assigned to Buyer hereunder and which may be
  required for such assignment to be effective.
  
     B.   PERIOD FROM EXECUTION TO CLOSING.
  
  From the date of this Agreement until the Closing, Seller
  will not, with respect to the Included Assets, engage in any
  material transaction including any material disposition of
  any of the Equipment, Inventories or Real Estate, without the
  prior written consent of Buyer.
  
     C.   PAYMENT OF TAXES.
  
  Seller shall pay when due any consolidated federal income tax
  liability, state or local corporate income or franchise tax
  liability (applied to each state or locality separately),
  payroll or other tax liability for the portion of any taxable
  period during which the income from Seller's Business is
  included in a consolidated return of the "affiliated group",
  within the meaning of Section 1504 of the Internal Revenue
  Code of 1986, as amended, of which Seller is a member. 
  Seller shall also pay when due all sales and use taxes and
  all other taxes and assessments of every kind and nature
  arising  out of the operation of the Seller's Business or the
  ownership of the Included Assets prior to the Closing.
  
     D.   PURCHASE PRICE ALLOCATION.
  
  Seller and Buyer shall allocate the Purchase Price for the
  Included Assets based upon an independent appraisal of the
  Included Assets to be completed by Buyer and concurred in by
  Seller after the Closing Date.  Buyer shall provide notice to
  Seller of such proposed allocation within a reasonable time
  after Buyer has completed the same, and Seller shall provide
  notice to Buyer whether Seller concurs in such allocation
  within a reasonable time after Seller's receipt of such
  proposed allocation.  The allocation shall be in accordance
  with federal and state laws and regulations, including but
  not limited to Section 1060 of the Internal Revenue Code of
  1986, as amended. Buyer and Seller each agree to file
  identical (except for taxpayer identification information)
  asset acquisition statements (IRS form 8594), in accordance
  with the agreed allocations for their respective taxable
  years which include the Closing Date. Buyer and Seller shall
  each indemnify, defend, save and keep the other party
  harmless against and from all liability, demands, claims,
  actions or causes of action, assessments, penalties, costs or
  expenses, including reasonable attorneys' fees, sustained or
  incurred by such other party as a result of the failure of 
  Buyer or Seller to properly file an asset acquisition
  statement in accordance with such agreed allocations.
  
     E.   INSPECTION BEFORE CLOSING.
  
  Pending the Closing, Seller shall furnish to Buyer all
  documents, reports and other information and data covering
  the Included Assets, and shall otherwise cooperate with Buyer
  in such manner as, Buyer may reasonably request.  Seller
  shall provide Buyer and its representatives with reasonable
  access to all financial records of Seller and its affiliates
  relating to Seller's Business and shall provide Buyer with
  copies of any such records requested by Buyer or its
  representatives.  Seller shall provide Buyer with copies of
  Seller's accounts payable records with respect to Seller's
  Business for the years ending December 31, 1995, 1996 and
  1997 and for the first two months of 1998.  At all reasonable
  times, Seller shall make the Facilities and the Included
  Assets available for examination and inspection by Buyer and
  its agents and representatives.
  
     F.   INSPECTION OF RECORDS AFTER CLOSING.
  
  From and after the Closing, Seller and Buyer shall each make
  their respective books and records, including tax and
  financial records, available to the other party with respect
  to all transactions of Seller's Business occurring prior to
  the Closing or relating to Seller's obligations which are
  assumed by Buyer (in the case of records owned by Seller, at
  its offices in Bethlehem, Pennsylvania, or such other place
  as shall be reasonable under the circumstances and, in case
  of records owned by Buyer, at its offices in Gulliver,
  Michigan, or its offices in Cleveland, Ohio or such other
  place as shall be reasonable under the circumstances), for
  inspection by the other party, or by its duly authorized
  representatives, for reasonable and necessary business
  purposes at all reasonable times during normal business
  hours, for a seven-year period after the Closing Date.  As
  used in this paragraph, the right of inspection includes the
  right to make extracts or copies at the expense of the party
  requesting such copies.  Buyer and Seller shall be permitted
  to destroy any of the books and records described in this
  Section VII(F) after three years following the Closing Date;
  provided, however, that for a period of seven years after the
  Closing Date, Buyer and Seller each shall give the other
  prior written notice of its intent to destroy any of the
  books and records described in this Section VII(F) and the
  party desiring to destroy records shall permit the other
  party to make reasonable arrangements to preserve or
  duplicate such records.
  
     G.   EMPLOYEES OF SELLER'S BUSINESS.
  
  Buyer shall offer employment as of the Closing Date to all
  employees of Seller's Business on the date immediately prior
  to the Closing Date, including any employees on vacation, but
  not any employees on short-term disability, worker's
  compensation,  long-term disability or leave of absence
  (hereinafter, "Employees" or, individually, "Employee"). 
  Such offer of employment to each Employee shall be at a rate
  of pay at least equal to such Employee's base rate of pay in
  effect on the day immediately prior to the Closing Date. 
  Buyer shall review the benefits provided by Seller to such
  Employees prior to the Closing Date and shall provide such
  Employees with benefits from and after the Closing Date of
  the types and in the amounts which Buyer provides to other
  similarly situated employees of Buyer.  Prior to the
  execution of this Agreement, Seller delivered to Buyer a
  listing of the current rates of pay, positions and dates of
  hire of the Employees. Buyer shall have no obligation
  whatsoever with regard to any persons who are not Employees
  or to Employees who do not accept Buyer's offer of
  employment.  Buyer shall be solely responsible for all
  salaries or wages and benefits accruing on or after the
  Closing Date. In the event Buyer terminates any Employee's
  employment with Buyer other than for cause within six (6)
  months after the Closing Date, Seller shall provide
  termination payments to such Employee in an amount equal to
  such Employee's then-current weekly rate of pay multiplied by
  such Employee's combined years of service with Seller and
  Buyer.  Seller shall retain the responsibility for, and
  indemnify, defend and hold Buyer harmless, against, all
  liabilities, claims and obligations of and to Employees,
  reported or unreported, which arise or accrue prior to the
  Closing Date including, but not limited to, their employment
  and the conditions thereof, employee welfare benefit plans of
  any type (including workers' compensation claims, medical and
  dental insurance coverage and long-term disability benefits)
  and salary, wages, bonus, deferred compensation, stock
  option, retirement, pension, or other benefit arrangement.
  
     H.   PRODUCT WARRANTIES.
  
  Buyer will cooperate with Seller concerning product
  warranties extended by Seller prior to Closing and shall
  promptly inform Seller of any complaints or claims made with
  respect to such warranties.  All such warranties shall remain
  the obligation of Seller, and Seller shall defend, indemnify
  and hold harmless Buyer against any loss, damage or expense
  relating to the same, provided that Buyer shall have complied
  with the requirement of notice and cooperation set forth in
  Section VII(I).  Buyer shall have the benefit of any express
  or implied warranties from the manufacturer or original
  seller of the Included Assets if the same is available to a
  transferee pursuant to the terms of the warranty, and Seller
  shall take all actions necessary and execute such instruments
  as are necessary to effect the transfer of the warranty.
  
     I.   THIRD PARTY CLAIMS.
  
  From and after the Closing, the parties shall provide prompt
  notice to one another and shall cooperate with each other
  with respect to any third party investigations and the
  defense of any claims or litigation made or commenced by
  third parties relating to the Included Assets or Seller's
  Business, provided that the party requesting cooperation
  shall reimburse the other party for the other party's
  reasonable out-of-pocket costs and expenses of furnishing
  such cooperation.  In the event Seller is required by law to
  mitigate impacts at the Facilities relating to Seller's
  operations, Buyer shall allow Seller to conduct such
  mitigation at the Facilities provided that Seller shall not
  unreasonably interfere with Buyer's ongoing or reasonably
  anticipated future mining operations.
  
     J.   BULK SALES LAWS.
  
  Seller and Buyer shall not give notice under the provisions
  of the Uniform Commercial Code of any states relating to bulk
  sales. Except as is otherwise specifically provided under
  this Agreement, Seller shall remain solely responsible to all
  of its creditors with respect to liabilities incurred
  relative to the conduct of Seller's Business prior to the
  Closing Date.  Notwithstanding anything to the contrary in
  this Agreement, Seller agrees to indemnify, defend and hold
  harmless Buyer for any loss or liability incurred by Buyer
  because of the failure to comply with the bulk sales laws of
  any state.
  
     K.   NOTICE;  BEST  EFFORTS TO  CONSUMMATE TRANSACTION.
  
  Each party shall promptly give the other party written notice
  upon its discovery of the existence or occurrence of any
  condition which would make any representation or warranty
  herein contained of either party untrue or which might
  reasonably be expected to prevent the consummation of the
  transactions herein contemplated. Neither Buyer nor Seller
  shall intentionally perform any act which, if performed, or
  omit to perform any act which, if omitted to be performed,
  would prevent or excuse the performance of this Agreement by
  Buyer or Seller or which would result in any representation
  or warranty herein contained being untrue in any material
  respect.
  
     L.   SCHEDULES.
  
  Buyer and Seller acknowledge that all Schedules and Exhibits
  referred to herein and not attached hereto at the time of
  execution shall be delivered after the date hereof, in
  accordance with this Section VII(L). Each party shall use its
  best efforts to deliver to the other each of the Schedules
  and Exhibits required to be delivered by such party as soon
  as possible and shall update all such Schedules and Exhibits
  as reasonably necessary prior to Closing and at Closing.
  
     M.   CASUALTY PRIOR TO CLOSING.
  
          1.   Effect on Purchase Price.
  
  If, prior to the Closing, any damage to or loss of any of the
  Included Assets occurs due to fire, flood, riot, act of God
  or other casualty (hereinafter "Casualty"), and if Buyer, in
  accordance with the provisions of this Agreement, does not
  elect, or is not permitted to elect, to terminate this
  Agreement, the Purchase Price (had there been no Casualty)
  shall be reduced by an amount equal to the value of such
  Casualty determined by the allocation provided under Section
  VII(D).
  
          2.   Termination Option.
  
  If, between the date hereof and the Closing, Casualty occurs
  to the Included Assets having a replacement cost of five
  million dollars ($5,000,000.00) or more, Buyer, at its
  option, may elect to terminate this Agreement or proceed to
  Closing.
  
     N.   HART-SCOTT-RODINO FILING.
  
  Seller and Buyer shall each use all reasonable efforts to
  expeditiously file completed notification reports under the
  Hart-Scott-Rodino Anti-Trust Improvements Act in connection
  with the transactions contemplated by this Agreement and will
  cooperate with each other in attempting to secure a waiver of
  the applicable waiting periods under the Act, and, upon the
  request of either the Federal Trade Commission or the United
  States Department of Justice, will use all reasonable efforts
  to supply such agency with any additional requested
  information as expeditiously as possible.
  
     O.   LIMESTONE AVAILABILITY AGREEMENT.
  
  As of the Closing Date, Buyer and Seller shall enter into a
  Limestone Availability Agreement in the form attached hereto
  as Exhibit VII(O).
  
     P.   CONFIDENTIALITY.
  
  In the event that the transactions contemplated by this
  Agreement are not consummated, Buyer will not use or
  disclose, nor will it permit any of its investors, employees,
  agents, or representatives to use or disclose, to any third
  parties, any written or oral information obtained from Seller
  or obtained through investigation of Seller's Business or the
  Included Assets, except to the extent that such information
  is publicly available or obtainable from independent sources
  or is required to be disclosed by law. In the event that the
  transactions contemplated by this Agreement are not
  consummated, any and all documents and other materials
  furnished by Seller to Buyer or its representatives, with
  respect to the transactions contemplated hereby, and all
  copies thereof, shall be returned to Seller forthwith.  This
  Section VII(P) shall survive any termination of this
  Agreement. In no event shall Buyer disclose to any third
  party information relating to any items set forth in the
  Disclosure Schedule, unless such disclosure is required by
  law, in which case Buyer shall provide advance notice of any
  proposed disclosure to Seller and shall afford Seller the
  opportunity to participate in such disclosure.
  
     Q.   NONCOMPETITION
  
  At Closing, Seller shall deliver a noncompetition agreement
  in the form attached hereto as Exhibit VII(Q), which prevents
  Seller, Specialty Minerals Inc., a Delaware corporation
  ("SMI"), Mineral Technologies Inc., a Delaware corporation
  ("MTI"), and any Affiliate of Seller, SMI or MTI from
  competing, directly or indirectly, against Buyer in the sale
  of any products currently sold from the Facilities as part of
  Seller's Business, in any geographic area serviced by Great
  Lakes shipping vessels, for a period of five (5) years after
  the Closing Date (the "Noncompetition Agreement").
  
     R.   OPERATION OF BUSINESS
  
  Seller shall operate, maintain and protect Seller's Business
  from the date of this Agreement until Closing in accordance
  with good operating and mining practices.  Except for the
  Deferred Charges, Seller shall not make, or incur liability
  for, any capital expenditures for additions or improvements
  to its plant or other business operations without Buyer's
  prior written consent.  Seller shall not pre-sell any product
  beyond that which can be produced through the normal
  operating rate of Seller's Business through the date prior to
  the Closing Date.  Seller shall not transfer or otherwise
  dispose of any Included Assets except for sales of Product
  Inventories to its customers in accordance with the terms of
  applicable customer orders and other transfers of Product
  Inventories in the ordinary course of business.  Seller shall
  not incur any obligation or liability, absolute, accrued,
  contingent, or otherwise, whether due or to become due,
  except for liabilities and obligations incurred in the
  ordinary course of Seller's Business. Seller shall not make,
  permit or suffer any adverse change in the financial
  condition of Seller's Business, the Included Assets, or its
  or Buyer's prospects for any aspect of Seller's Business
  prior to or after Closing, or waive any right or cancel or
  comprise any debt or claim included as part of the Included
  Assets, other than in the ordinary course of business. 
  Seller shall not make any material change in the rate of
  compensation, commission, bonus, perquisites, benefits or
  other remuneration payable, or paid or agreed to be paid to
  officers, directors, employees, salesmen or agents other than
  regularly scheduled increases about which Buyer has received
  prior notice and given its written consent.
  
     S.   DEFERRED CHARGES.
  
  From November 15, 1997 through the Closing Date, Seller has
  not incurred and will not incur any Deferred Charges or
  capital additions with respect to Seller's Business except
  for Deferred Charges and capital additions of the types and
  not in excess of the amounts set forth in Schedule VII(S)
  attached hereto.
  
  VIII.   CONDITIONS PRECEDENT TO BUYER'S OBLIGATIONS
  
  Each and every obligation of Buyer to be performed on the
  Closing Date shall be subject to the satisfaction prior
  thereto of the following conditions, upon the nonfulfillment
  of which this Agreement may be terminated in accordance with
  Section XIII;
  
     A.   REPRESENTATIONS AND WARRANTIES TRUE AT CLOSING.
  
  All representations and warranties made by Seller in this
  Agreement are true and correct in all material respects when
  given and on the Closing Date.
  
     B.   PERFORMANCE OF COVENANTS.
  
  Seller shall have performed and complied in all material
  respects with each and every covenant, agreement and
  condition required by this Agreement to be performed or
  complied with by it prior to or on the Closing Date.
  
     C.   NO MATERIAL ADVERSE CHANGE.
  
  There shall have been no material adverse change in the
  condition of the Included Assets or in the prospects for
  Seller's Business since the date hereof other than Casualty
  which has not resulted in termination of this Agreement.
  
     D.   NO LITIGATION.
  
  No suit or proceeding shall be pending before any court,
  administrative agency, governmental body or arbitration
  tribunal seeking to restrain, prohibit or restrict in any way
  the consummation of the transactions contemplated hereby, or
  to obtain damages or other relief in connection with this
  Agreement.
  
     E.   CORPORATE AUTHORITY.
  
  The execution, delivery and performance of this Agreement and
  the consummation of the transactions contemplated hereby
  shall have been approved by the Board of Directors of  Buyer
  and by the Board of Directors of Seller.
  
     F.   SCHEDULES.
  
  The Schedules and Exhibits which are required by this
  Agreement to be delivered to Buyer prior to Closing shall
  have been delivered to Buyer in accordance with the terms and
  provisions hereof and shall be in form and substance
  satisfactory to Buyer.
  
     G.   CONSENTS/GOVERNMENT APPROVALS.
  
  All consents to assignment, and all governmental approvals
  and consents, including the expiration or early termination
  of the Hart-Scott-Rodino waiting period, shall have been
  obtained or alternate arrangements reasonably satisfactory to
  Buyer shall have been made with respect to those contracts,
  leases,  licenses or permits for which in Buyer's reasonable
  judgment the inability to secure the benefits thereof would
  materially and adversely affect Buyer's ability to conduct
  business using the Facilities in a manner substantially
  equivalent to that conducted by Seller prior to Closing.
  
     H.   DELIVERIES.
  
  Buyer shall have received the items to be delivered pursuant
  to Section III(B)(2).
  
     I.   ENVIRONMENTAL ASSESSMENT.
  
  Buyer shall have received an environmental assessment of the
  Facilities reasonably satisfactory to Buyer and performed for
  Buyer's account by a consulting engineer chosen by Buyer
  ("Environmental Assessment"). Buyer shall inform Seller as to
  whether the Environmental Assessment is satisfactory to Buyer
  no later than the Closing Date.  If Buyer does not give
  notice to Seller that the Environmental Assessment is not
  satisfactory to Buyer on or before the Closing Date, this
  Section VIII(I) shall be waived by Buyer and shall be of no
  further force or effect.
  
     J.   TRANSFER OF ASSETS BY SMI.
  
  SMI shall have transferred to Buyer, for no additional
  consideration, all contract rights, permits and other assets
  relating primarily to Seller's Business which were titled in
  SMI's name prior to the incorporation of Seller and which
  remain titled in SMI's name as of the Closing Date, pursuant
  to instruments of transfer, assignment and conveyance which
  are acceptable to Buyer in form and substance, in each case
  to the extent legally transferable.
  
     K.   GUARANTY BY SMI AND MTI.
  
  SMI and MTI shall have entered into a Guaranty in the form
  attached hereto as Exhibit VIII(K), pursuant to which SMI and
  MTI shall, jointly and severally, absolutely and
  unconditionally guarantee the obligations of Seller under
  this Agreement and each of the other instruments and
  documents executed by Seller in connection with the
  transactions contemplated by this Agreement.
  
     L.   TRANSITION SERVICES AGREEMENT.
  
  Buyer, Seller and SMI shall have entered into a Transition
  Services Agreement (the "Transition Services Agreement") in
  the form attached hereto as Exhibit VIII(L) pursuant to
  which Seller and SMI will provide certain services to Buyer
  after the Closing relating to the operation of Seller's
  Business.
  
  IX.     CONDITIONS PRECEDENT TO SELLER'S OBLIGATIONS
  
  Each and every obligation of Seller to be performed on the
  Closing Date shall be subject to the satisfaction prior
  thereto of the following conditions, upon the nonfulfillment
  of which this Agreement may be terminated in accordance with
  Section XIII:
  
     A.   REPRESENTATIONS AND WARRANTIES TRUE AT CLOSING.
  
  All representations and warranties made by Buyer in this
  Agreement are true and correct in all material respects when
  given and on the Closing Date.
  
     B.   PERFORMANCE OF COVENANTS.
  
  Buyer shall have performed and complied in all material
  respects with each and every covenant, agreement and
  condition required by this Agreement to be performed or
  complied with by it prior to or on the Closing Date.
  
     C.   CORPORATE AUTHORITY.
  
  The execution, delivery and performance of this Agreement and
  the consummation of the transactions contemplated hereby
  shall have been approved by the Board of Directors of Buyer
  and the Board of Directors of Seller.
  
     D.   NO LITIGATION.
  
  No suit or proceeding is pending before any court,
  administrative agency, governmental body, or arbitration
  tribunal seeking to restrain, prohibit or restrict in any way
  the consummation of the transaction contemplated hereby or to
  obtain damages or other relief in connection with this
  Agreement.
  
     E.   DELIVERIES.
  
  Seller shall have received the items to be delivered pursuant
  to Section III(B)(1).
  
     F.   APPROVALS AND CONSENTS.
  
  All governmental approvals and consents, including the
  expiration or early termination of the Hart-Scott-Rodino
  waiting period, shall have been obtained.
  
     G.   GUARANTY BY ONC.
  
  Oglebay Norton Company, a Delaware corporation which is an
  Affiliate of Buyer ("ONC"),  shall have entered into a
  Guaranty in the form attached hereto as Exhibit IX(G),
  pursuant to which ONC shall absolutely and unconditionally
  guarantee the obligations of Buyer under this Agreement and
  each of the other instruments and documents executed by Buyer
  in connection with the transactions contemplated by this
  Agreement.
  
  X. SURVIVAL OF WARRANTIES AND REPRESENTATIONS
  
  The representations and warranties of Seller and Buyer
  contained in this Agreement or referred to in any closing
  document shall survive the Closing Date as hereinafter
  provided.  No claim shall be made for breach of any
  representation or warranty or indemnification with respect
  thereto, unless such claim is asserted in writing within (but
  not later than) three (3) years after the Closing Date.
  
  XI.     TAX RETURNS
  
  Each of Buyer and Seller shall honor all reasonable requests
  of the other for access to information relating to Seller's
  Business in the possession of the other that will assist the
  requesting party in preparation of a tax return relating to
  Seller's Business or the Included Assets for which the
  requesting party is responsible, or in the defense of such a
  return in the event of a subsequent audit.
  
  XII.    INDEMNIFICATION
  
     A.   SELLER'S INDEMNIFICATION COVENANTS.
  
  Seller shall indemnify, defend, save and keep Buyer, its
  Affiliates, their officers, directors, employees and agents,
  and their successors and assigns, harmless against and from
  all liability, demands, claims, actions or causes of action,
  assessments, penalties, costs, or expenses, including
  reasonable attorneys' fees, sustained or incurred by Buyer,
  its Affiliates, their officers, directors, employees or
  agents, or their successors or assigns:
  
          1.   as a result of or arising out of or by virtue
  of any incorrect representation or breach of warranty made by
  Seller to Buyer herein or in any closing document delivered
  to Buyer in connection herewith, provided, however, that
  Seller, in the absence of fraud or intentional
  misrepresentation by or on behalf of Seller, shall have no
  obligation to indemnify Buyer under this Section XII(A)(1)
  for any claim asserted by Buyer which arises after twenty-four
  (24) months after the Closing Date;
  
          2.   as a result of or arising out of or by virtue
  of the failure of Seller to comply with, or the breach by
  Seller of any of the covenants of this Agreement to be
  performed by Seller, provided, however, that Seller, in the
  absence of fraud or intentional misrepresentation by or on
  behalf of Seller, shall have no obligation to indemnify Buyer
  under this Section XII(A)(2) for any claim asserted by Buyer
  which arises after twenty-four (24) months after the Closing
  Date except for a breach of the covenant given in Section
  VII(Q), for which the indemnification period shall be five
  (5) years from the Closing Date; 
  
          3.   notwithstanding any other provision of this
  Agreement to the contrary, as a result of or arising out of
  or by virtue of any incorrect representation or breach of
  warranty made by Seller to Buyer in Section V(B), Section
  V(C)(relating to the Included Assets other than Real
  Property), Section V(M) or Section V(R), in any closing
  document delivered to Buyer in connection with such Sections,
  or Seller's failure to honor, discharge, pay or fulfill any
  responsibility, liability or obligation not assumed by Buyer
  pursuant to this Agreement, regardless of when such claim is
  asserted by Buyer; provided, however, that a claim shall not
  be asserted by Buyer with respect to any incorrect
  representation or breach of warranty made by Seller to Buyer
  in Section V(M)(2) unless and until the aggregate amount of
  all liabilities, demands, claims, actions or causes of
  action, assessments, penalties, costs or expenses, including
  reasonable attorneys' fees, sustained or incurred by Buyer,
  its Affiliates, their officers, directors, employees or
  agents, or their successors and assigns, exceeds the sum of
  One Hundred Thousand Dollars ($100,000), and then only to the
  extent of such excess; 
  
          4.   any increase in the cost of operation of
  Seller's Business during the 1998 and 1999 shipping seasons
  as a result of or arising out of or by virtue of any delay in
  the issuance of, or any failure or refusal to issue, the
  permit described in Section V(Z).  For purposes of
  determining the increase in the cost of operation of Seller's
  Business pursuant to this Section XII(A)(4), the parties
  hereby agree that the amount of such increase shall be deemed
  to be five cents ($.05) per ton of Limestone or Dolomite
  mined by Buyer until such permit is issued; and
  
          5.   as a result of, in consequence of or arising
  out of, under or by reason of any ERISA Plan maintained by or
  contributed to by the Seller or its Affiliates (including,
  but not limited to, any liability pertaining to any of
  Seller's obligations under the minimum funding standards of
  ERISA and of the Code).
  
     B.   BUYER'S INDEMNIFICATION COVENANTS.
  
  Buyer shall indemnify, defend, save and keep Seller, its
  Affiliates, their officers, directors, employees and agents,
  and their successors and assigns, harmless against and from
  all liability, demands, claims, actions or causes of action,
  assessments, penalties, costs, expenses, including reasonable
  attorneys' fees, sustained or incurred by Seller, its
  Affiliates, their officers, directors, employees or agents,
  or their successors and assigns:
  
          1.   as a result of or arising out of or by virtue
  of any incorrect representation or breach of warranty made by
  Buyer to Seller herein or in any closing document delivered
  to Seller in connection herewith, provided, however, that
  Buyer, in the absence of fraud or misrepresentation by or on
  behalf of Buyer, shall have no obligation to indemnify Seller
  under this Section XII(B)(1) for any claim asserted by Seller
  which arises after twenty-four (24) months after the Closing
  Date;
  
          2.   as a result of or arising out of or by virtue
  of the failure of Buyer to comply with, or the breach by
  Buyer of, any of the covenants of this Agreement to be
  performed by Buyer, provided, however that Buyer, in the
  absence of fraud or misrepresentation by or on behalf of
  Buyer, shall have no obligation to indemnify Seller under
  this Section XII(B)(2) for any claim asserted by Seller which
  arises after twenty-four (24) months after the Closing Date;
  and
  
          3.   as a result of or arising out of or by virtue
  of (i) any product liability claims made against Seller or
  Seller's Business resulting solely from any Products that are
  shipped from the Facilities at any time after the Closing or
  (ii) Buyer's failure to honor, discharge, pay or fulfill any
  liabilities or obligations assumed by Buyer in this
  Agreement.
  
     C.   NOTICE OF INDEMNIFICATION.
  
  In the event any legal proceeding or investigation shall be
  threatened or instituted or any claim or demand shall be
  asserted by any person in respect of which payment may be
  sought by one party hereto from the other party under the
  provisions of this Section XII (hereinafter, "Claim"), the
  party seeking indemnification (the "Indemnitee") shall
  promptly cause written notice of the assertion of any such
  Claim of which it has knowledge and which is covered by this
  indemnity to be forwarded to the other party (the
  "Indemnitor"), which notice must be received by the
  Indemnitor prior to the expiration of twenty-seven (27)
  months after the Closing Date (except for indemnification
  sought pursuant to Section XII(A)(3), Section XII(A)(4),
  Section XII(A)(5) or Section XII(B)3).  Any such notice shall
  state specifically the provision of this Agreement with
  respect to which the Claim is made, the facts giving rise to
  such Claim, and the amount of the liability asserted against
  the Indemnitor by reason of the Claim.
  
     D.   INDEMNIFICATION PROCEDURE FOR THIRD-PARTY CLAIMS.
  
  In the event of the initiation of any legal proceeding
  against an Indemnitee by a third party, the Indemnitor shall
  have the absolute right after the receipt of notice, at its
  option and at its own expense, to engage counsel of its
  choice and to defend against, negotiate, settle, (but not
  without the prior consent of Indemnitee which consent shall
  not be unreasonably withheld) or otherwise deal with any
  proceeding, claim, or demand which relates to any loss,
  liability, or damage indemnified against hereunder, and the
  Indemnitee shall cooperate fully with the Indemnitor.
  
     E.   EXCLUSIVE REMEDY.
  
  Except as is otherwise specifically set forth in this
  Agreement, the exclusive remedy available to a party hereto
  in respect of a breach by the other party of its obligations
  under this Agreement shall be to proceed in the manner set
  forth in this Section XII and subject to the limitations set
  forth herein.  Notwithstanding anything else in this
  Agreement to the contrary, the limitations of Section
  XII(A)(1) and the provisions of this Section XII(E) shall not
  apply to any breach of Seller's warranties set forth in the
  Warranty Deeds referred to in Section I(D)b.
  
     F.   RESPONSIBILITY UNDER CERTAIN ENVIRONMENTAL LAWS.
  
  No provision of this Agreement shall limit or otherwise
  restrict any liability or responsibility of either party to
  the other or in any manner under or in connection with the
  Comprehensive Environmental Response, Compensation and
  Liability Act, as amended, 42 USC 9601, et seq., the Resource
  Conservation and Recovery Act of 1976, as amended, 42 USC
  6901, et seq., and Parts 111 and 303 of the Michigan Natural
  Resources and Environmental Protection Act.
  
     G.   ARBITRATION.
  
  Each party agrees that to the extent any dispute arising in
  connection with this Agreement is not resolved by voluntary
  agreement of the parties, such dispute shall be finally and
  exclusively settled by arbitration in accordance with the
  provisions of this Section XII(G).  If any such dispute
  arises, either party may at any time deliver written notice
  that it intends to submit such dispute to arbitration.  If
  such a notice is delivered to the other party, then the party
  that delivered such notice shall be entitled to direct
  submission of the dispute to arbitration.  The party
  directing a submission to arbitration shall promptly deliver
  written notice to the other party.  Notwithstanding this
  Section XII(G), each party shall have the right to seek from
  any court of competent jurisdiction pending the establishment
  of the arbitral tribunal interim relief in aid of arbitration
  or to protect the rights of such party in respect of this
  Agreement.  Any request for such interim relief by a party
  shall not be deemed incompatible with, or a waiver of, this
  agreement to arbitrate.  Such arbitration shall be held in
  Detroit, Michigan (which shall be the exclusive location of
  such arbitration unless otherwise agreed by the parties) in
  accordance with the commercial arbitration rules and
  regulations of the American Arbitration Association, with
  pre-hearing discovery rights in accordance with the Federal
  Rules of Civil Procedure.  The determination of the
  arbitrators shall be conclusive and binding upon the parties,
  and any determination by the arbitrators of an award may be
  filed with the clerk of a court of competent jurisdiction as
  a final adjudication of the claim involved, where application
  may be made to such court for a judicial acceptance of the
  award and an order of enforcement, as the case may be.  The
  expenses of each party, including legal and accounting fees,
  if any, with respect to the arbitration, shall be borne by
  such party, except to the extent otherwise directed by the
  arbitrators.  The arbitrators shall designate the parties to
  bear the expenses of the arbitrators of the respective
  amounts of such expense to be borne by each party.
  
  XIII.   TERMINATION: RIGHT TO DAMAGES
  
  If this Agreement is terminated pursuant to its terms,
  neither party hereto shall have any claim against the other
  except if the circumstances giving rise to such termination
  were caused by the other party's willful breach of any
  covenant or agreement in this Agreement, by a representation
  known by such other party to be false when made, or by a
  closing document delivered by such other party being
  knowingly incorrect when delivered; in which events such
  termination shall be in violation of this Agreement and shall
  not be deemed or construed as limiting or denying any legal
  or equitable right or remedy of said party.
  
  XIV.    MISCELLANEOUS
 
     A.   LAW GOVERNING AGREEMENT.
  
  This Agreement shall be governed by and construed in
  accordance with the laws of the State of Michigan.
  
     B.   NOTICES.
  
  All notices, requests, demands and other communications
  hereunder shalt be deemed to have been duly given, if
  delivered by hand or mailed, by registered mail with postage
  prepaid:
  
          1.   To Seller.
  
  If to Seller, to:
  
     Mr. Paul R. Saueracker
     President
     Speciality Minerals Inc.
     405 Lexington Avenue
     New York, New York 10174-1901
  
  with a copy to:
  
     S. Garrett Gray
     General Counsel
     Minerals Technologies Inc.
     405 Lexington Avenue
     New York, New York 10174-1901
  
  or to such other person or address as Seller shall furnish to
  Buyer in writing.
  
          2.   To Buyer. 
  
  If to Buyer, to:
  
     Oglebay Norton Company
     1100 Superior Avenue
     Cleveland, Ohio 44114
     Attention: Jeffrey S. Gray
     Vice President-Corporate Development and Legal Affairs
  
  with a copy to:
  
     Christopher C. McCracken, Esq.
     Ulmer & Berne LLP
     Bond Court Building
     1300 East Ninth Street, Suite 900
     Cleveland, Ohio 44114
  
  or to such other person or address as Buyer shall furnish to
  Seller in writing.
  
     C.   EXPENSES.
  
  Except as otherwise provided herein, each of the parties
  shall be responsible for the fees and expenses of its
  counsel, brokers, and other agents and any other costs
  incurred by it in connection with the transaction
  contemplated hereby.
  
     D.   HEADINGS.
  
  The headings in the paragraphs of this Agreement are inserted
  for convenience only and shall not constitute a part hereof.
  
     E.   FURTHER COOPERATION
  
  From and after the Closing Date, Buyer and Seller agree to
  execute and deliver all other documents and to take such
  other action or corporate proceedings as may be reasonably
  necessary or desirable to confirm and vest title to the
  Included Assets in Buyer and to carry out and give effect to
  all of  the terms and conditions of this Agreement.  Without
  limiting the generality of the foregoing, Seller, SMI and
  Buyer shall cooperate with each other with respect to the
  services to be provided to Buyer pursuant to the terms of the
  Transition Services Agreement.
  
     F.   NO THIRD PARTY BENEFICIARIES.
  
  Rights and duties hereunder shall inure to the benefit of the
  parties hereto only and not to the benefit of any third
  parties, including but not limited to, employees of Buyer or
  Seller.
  
     G.   SEVERABILITY.
  
  If any provision of this Agreement shall be deemed or
  adjudged invalid or unenforceable to any extent, the
  remainder of this Agreement shall not be affected thereby and
  shall be enforced to the full extent permitted by law.
  
     H.   BINDING AGREEMENT AND ASSIGNABILITY.
  
  Each term and provision of this Agreement shall be binding
  upon and enforceable against any successors or assigns of
  Seller or Buyer. This Agreement shall not be assignable by
  either party without the consent of the other party except
  that Buyer may assign this Agreement to any entity which is
  controlled by Buyer without the consent of Seller.
  
     I.   COMPLETE AGREEMENT.
  
  This document and the documents (including exhibits and
  schedules) referred to herein contain the complete agreement
  between the parties and supersede any and all prior
  understandings, agreements or representations by or between
  the parties, written or oral, which may have related to the
  subject matter hereof in any way.
  
     J.   COUNTERPARTS.
  
  This Agreement may be executed in two or more counterparts,
  each of which shall be deemed an original, but all of which
  together shall constitute one and the same instrument.
  
     K.   NON-WAIVER AND OTHER MISCELLANEOUS MATTERS.
  
  No delay on the part of Seller or Buyer in the exercise of
  any right, power or remedy shall operate as a waiver thereof,
  nor shall any single or partial exercise by Seller or Buyer
  of any right, power or remedy preclude other or further
  exercise thereof, or the exercise of any other right, power
  or remedy. No amendment, modification, termination or waiver
  at or consent with respect to, any provision of this
  Agreement shall in any event be effective unless the same
  shall be in writing and signed and delivered by Seller and
  Buyer, and then any such amendment, modification,
  termination, waiver or consent shall be effective only in the
  specific instance and for the specific purpose for which
  given.  Consummation of the transaction contemplated herein
  shall not be deemed a waiver or a breach of any
  representation, warranty or covenant or of any party's rights
  and remedies with regard thereto.  No specific
  representation, warranty or covenant shall limit the
  generality or applicability of a more general representation,
  warranty or covenant. A breach of any representation,
  warranty or covenant shall not be affected by the fact that a
  more general representation, warranty or covenant was not
  also breached.
  
     L.   PUBLICITY AND NEWS RELEASES.
  
  Except as required by law, no publicity, release or
  announcement concerning the transactions contemplated by this
  Agreement shall be issued without the advance approval in
  writing of the substance thereof by each of the parties
  hereto and their respective legal counsel. Each party will
  consult with the other as to any release or announcement
  required by law prior to the making of the same.
  
     IN WITNESS WHEREOF, the parties have executed this
  Agreement as of the date first written above.   
  
                         SELLER
  
                         SPECIALTY MINERALS (MICHIGAN) INC.
  
                              By____/s/ William A. Kromberg__________
  
                              Title__Vice President _________________
  
  
                         BUYER
  
                         OGLEBAY NORTON LIMESTONE COMPANY
  
                              By______/s/ Jeffrey Gray ______________
  
                              Title___Vice President_________________