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.
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Both thin section images were taken at a 400x magnification. ]]>2017-06-01T08:18:30-07:00
Title
Brahma Schist
Alternative Title
Schist
Identifier
GC-2
Description
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.