Granitoid Gneiss

Biotite ferrohastingsite granodioritic and granitic gneiss with large schlieren of biotite, locally contains garnet and muscovite.
State Massachusetts
Name Granitoid Gneiss
Geologic age Proterozoic Y
Lithologic constituents
Major
Metamorphic > GneissBiotite ferrohastingsite granodioritic and granitic gneiss with large schlieren of biotite, locally contains garnet and muscovite.
Comments Part of Taconic-Berkshire Zone (Ordovician and Older Rocks)
References
NGMDB product
Counties Berkshire - Hampden