GRD000XS0
I-34
Rhyolite
Cenozoic › Neogene › Miocene
5.3
-
23.0
1
Ritter 154 › Cabinet 15 › Drawer F
porphyry,resorption,Flow alignment,Chalcedony Veins
-
Age data from McCurry et al 1988, found in USGS Preliminary geologic map of the East Mojave National Scenic Area, California
Van Winkel Mtns
California
Van Winkel Mtns, 30 mi NE of Amboy
Latitude: 34.99°
Longitude: -115.29°
-
Resorption features in feldspar.
2.5
plane
Resorption in feldspar and growth patterns in chalcedony.
2.5
crossed
-
scan
crossed
GRD000XT0: Resorbed plagioclase (albite and polysynthetic twinning) with rim overgrowths, some plagiclase exhibit oscillatory zoning, K-spar (microcline twinning), biotite, minor amount of amphibole, glomerocrysts composed of plagioclae, biotite, and oxides, growth patterns in chalcedony, (C. Eichler)
N/A
N/A