Alaskite

Alaskite (Conley, 1985). White to light-gray, medium to coarse-grained leucocratic muscovite granite and granite gneiss. Mineralogy: potassium feldspar (perthite or microcline) + plagioclase + quartz + muscovite ± biotite ± epidote ± kyanite ± garnet. Geophysical signature: negative or flat magnetic signature; positive radiometric signature. Commonly occurs as folded sheets parallel to schistosity and as lit-par-lit injections in the Bassett and Fork Mountain Formations (Smith River Allochthon) and near the base of the Lynchburg Group (Ashe Formation or Moneta Gneiss) in the Blue Ridge or Sauratown Mountains anticlinoria.
State Virginia
Name Alaskite
Geologic age Proterozoic
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Leucocratic-granitic > Alaskite
Comments Western Piedmont, Southwest and Central
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 Franklin - Henry - Pittsylvania