GRD02A8S0
M-74
Metamorphic Structures
Unknown
None
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1
Ritter 154 › Cabinet 14 › Drawer P
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Quartz-potassium feldspar-biotite-chlorite (trace) gneiss in contact with potassium feldspar-quartz pegmatite. Gneiss is medium-grained with quartz sigma-clasts. Pegmatite is very coarse-grained. Possibly some vesuvianite? Coarse-grained chlorite between gneiss and pegmatite.
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California
Alpine
Latitude: 32.8°
Longitude: -116.8°
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Aligned biotite in quartz and plagioclase
2.5
plane
Aligned biotite in quartz and plagioclase
2.5
crossed
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scan
crossed
GRD02A8T0: Gneiss is on half of the slide; the other half is empty. 50% quartz (undulose extinction), 30% Plagioclase (concentric zonation), 20% biotite. Biotite is aligned. Trace K-spar (C. Eichler)
N/A
N/A