GRD020LS0
M-51
Layered Gneiss
Unknown
None
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1
Ritter 154 › Cabinet 14 › Drawer B
fine-grained
Fine-grained (cryptocrystalline) gneiss with folds and augen. Quartz-pyroxene-pyrite (rare). Foliated with continuous thin bands- relict bedding/laminations (?).
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2.5
plane
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2.5
crossed
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scan
crossed
GRD020LT0: Well-developed, thin bands. 75% quartz, 24% clinopyroxene (birefringent, inclined extinction, 2nd order blue, uniaxial), 1% acicular opaques. Opaques are aligned. (C. Eichler)
N/A
N/A