Porphyritic Granite

Light-gray to pink, medium to coarse-grained, coarse granular texture common; locally pegmatitic. Mineralogy: quartz + porphyroblastic microcline + biotite + muscovite ± epidote ± titanite ± opaque minerals.
State Virginia
Name Porphyritic Granite
Geologic age Proterozoic
Lithologic constituents
Major
Igneous > Plutonic > GraniticPorphyritic granite
Comments Carolina Slate Belt
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