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Temporal Coverage is exactly "Older Precambrian"
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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.
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.
Vishnu Schist
Both cross polarized and plain polarized images were taken at a 400x magnification.
Vishnu Schist
Both thin section images were taken at a 400x magnification.
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