GRD020CS0
M-237
Non-layered Gneiss
Unknown
None
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1
Ritter 154 › Cabinet 24 › Drawer B
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Potassium feldspar-quartz-magnetite. Large feldspar augen (some with laboradorescence) and thin wispy layers of magnetite. Mica-poor gneiss (?)
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-
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Micro-quartz bands in larger quartz crystal
2.5
plane
Micro-quartz bands in larger quartz crystal
2.5
crossed
Small sphene and amphibole cluster
2.5
plane
Small sphene and amphibole cluster
2.5
crossed
-
scan
crossed
GRD020CT0: Grain size reduction (micro-quartz bands). Potassium feldspar, plagioclase, quartz, opaques, amphibole (?, pale green brown, being replaced) sphene (diamond shaped), apatite (?). (J. Gee)
N/A
N/A