GRD0011S0
I-39
Rhyolite
Cenozoic › Neogene › Miocene
5.3
-
23.0
1
Ritter 154 › Cabinet 15 › Drawer F
crystal rich,resorption,porphyry
Original label: Rhyolite with minor blue zoisite.
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°
-
Large embayed potassium feldspar with euhedral amphibole.
2.5
plane
Large embayed potassium feldspar with euhedral amphibole
2.5
crossed
-
scan
crossed
GRD0011T0: Large plaigoclase (polysynthetic twinning) with twinned crystal growth, smaller plagioclase with albite and polysynthetic twinning, euhedral hornblende, plagioclase glomerocrysts. Resorbed minerals: plagioclase, sanidine, amphibole, quartz, biotite (C. Eichler)
N/A
N/A