| Document and Entity Information | Aug. 09, 2022 |
| Cover [Abstract] | |
| Entity Registrant Name | Gemini Therapeutics, Inc. /DE |
| Amendment Flag | false |
| Entity Central Index Key | 0001816736 |
| Document Type | 8-K |
| Document Period End Date | Aug. 09, 2022 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39438 |
| Entity Tax Identification Number | 85-1612845 |
| Entity Address, Address Line One | 297 Boston Post Road #248 |
| Entity Address, City or Town | Wayland |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01778 |
| City Area Code | (617) |
| Local Phone Number | 401-4400 |
| Written Communications | true |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.0001 per share |
| Trading Symbol | GMTX |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
