GRD021DS0
M-102
Augen Gneiss
Precambrian › Proterozoic
542.0
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2500.0
0
Ritter 154 › Cabinet 24 › Drawer A
coarse-grained,augen
Medium-sized sample of augen gneiss composed of potassium feldspar-quartz-biotite-amphibole. Sample has discontinuous banding and poorly developed augen. Melanocratic bands: biotite and amphibole; Leucocratic bands: Potassium feldspar and quartz. No rose quartz. Original description: Gneiss with rose quartz augen.
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California
Boullion Mountains, 8 miles south of Amboy
Latitude: 34.429°
Longitude: -115.776°
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