Porphyritic Granite

Pink to white, medium- to very coarse- grained; mineralogy includes quartz, microcline porphyroblasts, plagioclase, muscovite, and minor biotite. This rock intrudes migmatitic paragneiss (mpg) southeast of Farmville Mesozoic basin.
State Virginia
Name Porphyritic Granite
Geologic age Proterozoic
Lithologic constituents
Major
Igneous > Plutonic > Granitic > GranitePorphyritic granite
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 Prince Edward