GRD01UPS0
M-1
Non-layered Gneiss
Unknown
None
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1
Ritter 154 › Cabinet 14 › Drawer A
medium-grained,quartzofeldspathic
Quartzofeldspathic-muscovite-biotite. Moderately gneissic. Recrystallized vein composed of quartz and pink potassium feldspar.
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Anhedral K-spar
5.0
plane
Anhedral K-spar
5.0
crossed
-
scan
crossed
GRD01UPT0: 50% quartz, 35% potassium feldspar (tartan twinning), 5% biotite, 5% muscovite, 5% opaques. K-spar and quartz are anhedral. Large vein cross-cutting thin section. (C. Eichler)
N/A
N/A