Hoosac Schist

Light- to medium-gray, rusty-weathering, fine- to medium-grained schist and poorly layered schistose gneiss, composed of quartz, biotite, plagioclase, muscovite, and generally garnet and sillimanite or kyanite.
State Connecticut
Name Hoosac Schist
Geologic age Cambrian?
Lithologic constituents
Major
Metamorphic > GneissLight- to medium-gray, rusty-weathering, fine- to medium-grained schist and poorly layered schistose gneiss, composed of quartz, biotite, plagioclase, muscovite, and generally garnet and sillimanite or kyanite.
Metamorphic > SchistLight- to medium-gray, rusty-weathering, fine- to medium-grained schist and poorly layered schistose gneiss, composed of quartz, biotite, plagioclase, muscovite, and generally garnet and sillimanite or kyanite.
Comments Part of Western Uplands; Proto-North American (Continental) Terrance - Displaced Iapetus Terrane. In Vermont: Age of Hoosac is Late Proterozoic and Early Cambrian per CT004.
References
NGMDB product
Counties Hartford - Litchfield