Amphibolite

Metamorphosed mafic extrusive and intrusive rock; includes hornblende gneiss, thin layers of mica schist, calc-silicate rock, and, rarely, marble. Also includes small masses of metadiorite and metagabbro.
State North Carolina
Name Amphibolite
Geologic age Cambrian/Late Proterozoic
Lithologic constituents
Major
Metamorphic > Amphibolite (Amphibolite)Amphibolite - metamorphosed mafic extrusive and intrusive rock
Minor
Metamorphic > Gneiss > Hornblende-gneiss
Metamorphic > Metasedimentary > Calc-silicate-rock
Metamorphic > Schist > Mica-schistthin layers of mica schist
Incidental
Metamorphic > Metaigneous > Metaintrusive > MetadioriteAlso includes small masses of metadiorite and metagabbro
Metamorphic > Metasedimentary > Metacarbonate > Marble
Metamorphic > Metaigneous > Metaintrusive > MetagabbroAlso includes small masses of metadiorite and metagabbro
References

Rhodes, Thomas S., and Conrad, Stephen G., 1985, Geologic Map of North Carolina: Department of Natural Resources and Community Development, Division of Land Resources, and the NC Geological Survey, compiled by Brown, Philip M., et al, and Parker, John M. III, and in association with the State Geologic Map Advisory Committee, scale 1:500,000.

The North Carolina Dept. of Environment, Health, and Natural Resources, Division of Land Resources, NC Geological Survey, in cooperation with the NC Center for Geographic Information and Analysis, 1998 (updated 2007), Geology - North Carolina (1:250,000), coverage data file geol250. The data represents the digital equivalent of the official State Geology map (1:500,000 scale), but was digitized from (1:250,000 scale) base maps.

NGMDB product
Counties Iredell - Rockingham - Stokes - Yadkin