Lahore Complex - Pyroxene monzonite

Dark-gray to black, fine- to medium-grained, massive- to indistinctly-foliated; consists of large, locally-twinned augite, poikilitic in part, enclosing apatite, opaque oxide, biotite, and plagioclase. Compositionally-zoned and unzoned plagioclase is also a significant coarse-grained consitituent. This lithology is gradational into amphibole monzonite.
State Virginia
Name Lahore Complex - Pyroxene monzonite
Geologic age Ordovician
Lithologic constituents
Major
Igneous > Plutonic > Syenitic > Monzonite
Comments Western Piedmont (Northern)
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 Orange