Pegmatite
This sample is mis-labeled as a pegmatite. It is really a porphyritic dike material that cuts through the Zoroaster Granite. The phenocrysts are hornblende.
no date
Western Minerals Inc.
GC-3
Brahma Schist
Part of the The Granite Gorge Metamorphic Suite, this is usually considered a metavolcanic, and its mineralogy is dominated by quartz and mica.
Both thin section images were taken at a 400x magnification.
no date
Western Minerals Inc.
GC-2
Vishnu Schist
Both cross polarized and plain polarized images were taken at a 400x magnification.
no date
Western Minerals Inc.
GC-1A
Vishnu Schist
Both thin section images were taken at a 400x magnification.
no date
Western Minerals Inc.
GC-1