GRD01XNS0
M-68
Augen Gneiss
Unknown
None
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1
Ritter 154 › Cabinet 14 › Drawer B
medium-grained,augen
Small slab of gneiss composed of quartz-muscovite-potassium feldspar; Foliated/banding. Potassium feldspar augen.
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Alpine
Latitude: 32.8°
Longitude: -116.8°
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K-spar porphyroblast surrounded by quartz and muscovite.
2.5
plane
K-spar porphyroblast surrounded by quartz and muscovite.
2.5
crossed
-
scan
crossed
GRD01XNT0: 40% potassium feldspar, 40% quartz. 20% muscovite. Potassium feldspar porphyroblasts. Occasional quartz porphyroblasts. One very large inclusion-rich K-spar porphyroblast. (C. Eichler)
N/A
N/A