GRD0006S0
I-6
Granite
Precambrian › Proterozoic › Paleoproterozoic › Statherian
1600.0
-
1800.0
1
Ritter 154 › Cabinet 15 › Drawer A
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Fresh. Q, Kspar (microcline), Plag, Musc. About 1.6 Ga.
No PPL photomicrograph for this sample.
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South Dakota
Mt Rushmore, Black Hills
Latitude: 43.8°
Longitude: -103.4°
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Quartz, k-spar, and muscovite
2.5
crossed
-
scan
crossed
GRD0006T0: quartz>microcline>muscovite>plag; some muscovite inclusions within microcline. (C. Eichler)
N/A
N/A