GRD0206S0
M-2
Non-layered Gneiss
Precambrian › Proterozoic › Mesoproterozoic
1000.0
-
1600.0
1
Ritter 154 › Cabinet 14 › Drawer A
coarse-grained
Large sample of a well-foliated, medium- to coarse-grained gneiss. The sample contains a large band of scapolite, biotite, quartz, potassium feldspar, and pyroxene. The band is between biotite-rich layers with less scapolite. Possibly part of a migmatite.
-
-
Canada
East Bancroft, Ontario
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K-spar, biotite, and pyroxene
2.5
plane
K-spar, biotite, and pyroxene
2.5
crossed
-
scan
crossed
GRD0206T0: 50% Pyroxene, 25% potassium feldspar (tartan twinning), 10% scapolite, 10% biotite, 5% spinel (high relief, isotropic). (C. Eichler)
N/A
N/A