GRD01XPS0
M-81
Lineation
Mesozoic › Cretaceous
65.5
-
145.5
1
Ritter 154 › Cabinet 24 › Drawer I
lineations,medium-grained
Large sample of gneiss composed of plagioclase-biotite-quartz. Well-foliated with lineations. Fine- to medium-grained. Original description: hornblende gneiss or amphibolite; Jurassic-Cretaceous.
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-
California
Glenview
Latitude: 32.8°
Longitude: -116.9°
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Inclusion-rich plagioclase with a cluster of biotite in quartz groundmass
2.5
plane
Inclusion-rich plagioclase with a cluster of biotite in quartz groundmass
2.5
crossed
-
scan
crossed
GRD01XPT0: 40% plagioclase, 35% quartz, 25% biotite. Inclusion-rich plagioclase. Inclusions include biotite and amphibole?. Quartz is inclusion-free. Small to large grains of biotite. The biotite typically forms aggregates (i.e. few individual crystals). (C. Eichler)
N/A
N/A