Biotite-Hornblende Granodiorite

Mesocratic, medium- to coarse-grained, equigranular, massive to vaguely foliated granodiorite contains poikilitic green-brown hornblende, subhedral in part; lesser reddish-brown biotite, and accessory apatite, magnetite-ilmenite, and zircon; color index 30 to 40.
State Virginia
Name Biotite-Hornblende Granodiorite
Geologic age Proterozoic Y
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Granodiorite
Comments Blue Ridge Basement Complex, Middle Proterozoic (Grenville-Age) Plutonic Rocks
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 Amherst - Nelson