GRD01ZUS0
M-213
Non-layered Gneiss
Unknown
None
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1
Ritter 154 › Cabinet 24 › Drawer B
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Medium-sized sample of a gneiss composed of quartz-muscovite-plagioclase-pyrite (trace). Little to no banding present.
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N/A
Schistose muscovite and chlorite in quartz and k-spar
2.5
plane
Schistose muscovite and chlorite in quartz and k-spar
2.5
crossed
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scan
crossed
GRD01ZUT0: 15% mica, 10% amphibole, quartz, potassium feldspar, plagioclase, opaques. The muscovite and green chlorite are schistose. Not the best sample for teaching. (J. Gee)
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