GRD00GCS0
I-673
Rhyolite
Cenozoic › Paleogene › Oligocene
23.0
-
33.9
1
Ritter 154 › Cabinet 15 › Drawer G
-
Rhyolite with flow bands. Minerals include topaz, spessartine, quartz, sanidine.
~30 Ma
-
Colorado
Ruby Mtn, Chaffee County
Latitude: 38.7°
Longitude: -106.1°
-
Plagioclase crystals
5.0
plane
Simple twinning in plagioclase
5.0
crossed
-
scan
crossed
GRD00GCT0: Feldspar and quartz. Very fine grained. (C. Eichler)
N/A
N/A