| Fairfield County | ||
| Birrman Quarry | bertrandite | |
| Branchville | dickinsonite, lithiophilite, purpurite | |
| Brookfield | greenockite | |
| Cod Fish Hill | dravite | |
| Hartford County | ||
| Bristol | chalcocite | |
| Collinsville | kyanite | |
| Litchfield County | ||
| Canaan | tremolite | |
| New Hartford | anthophyllite | |
| Roxbury | pyrite | |
| Woodbury | pumpellyite-(Mg) | |
| Middlesex County | ||
| Cobalt | chathamite | |
| East Hampton | beryl | |
| Haddam | maghemite | |
| Portland | lepidolite, spodumene | |
| West Portland | samarskite-(Y) | |
| Windham County | fasciculite | |