GRD001KS0
I-58
Welded Ignimbrite
Cenozoic › Neogene › Miocene
5.3
-
23.0
1
Ritter 154 › Cabinet 15 › Drawer L
-
Original description: Rhyolite.
Age from Glazner et all 1986
Marble Mtns
California
Marble Mtns, 5 mi E of Amboy
Latitude: 34.56°
Longitude: -115.66°
-
Large sanidine crystal in brownish matrix.
2.5
plane
Concentric zonation and blue dispersion in sanidine.
2.5
crossed
-
scan
crossed
GRD001KT0: Sanidine (polysynthetic twinning, some skeletal), plagioclase (albite), quartz, amphibole, orthopyroxene, hematite bleb (C. Eichler)
N/A
N/A