Pinkish-gray, fine-grained, well-laminated felsic biotite-microcline-plagioclase-quartz gneiss

Probably metamorphosed rhyolite.
State Massachusetts
Name Pinkish-gray, fine-grained, well-laminated felsic biotite-microcline-plagioclase-quartz gneiss
Geologic age Proterozoic Y
Lithologic constituents
Major
Metamorphic > GneissPinkish-gray, fine-grained, well-laminated felsic biotite-microcline-plagioclase-quartz gneiss - Probably metamorphosed rhyolite.
Comments Part of Taconic-Berkshire Zone (Ordovician and Older Rocks); in Berkshire Highlands and Green Mountain Core
References
NGMDB product
Counties Berkshire