Biotite Gneiss and Schist

Dark-gray, medium grained, foliated and broadly-layered. Mineralogy: biotite + plagioclase + potassium feldspar + quartz + muscovite; accessory minerals include titanite, epidote, and opaque minerals.
State Virginia
Name Biotite Gneiss and Schist
Geologic age Proterozoic
Lithologic constituents
Major
Metamorphic > Schist
Metamorphic > Gneiss > Biotite-gneiss
Comments Central Piedmont
References

Virginia Division of Mineral Resources, 1993, Geologic Map of Virginia: Virginia Division of Mineral Resources, scale 1:500,000.

Virginia Division of Mineral Resources, 2003, Digital Representation of the 1993 Geologic Map of Virginia, Publication 174, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, scale 1:500,000.

NGMDB product
Counties Lunenburg - Prince Edward