GRD001ZS0
I-74
Rhyolite
Cenozoic › Neogene › Miocene
5.3
-
23.0
1
Ritter 154 › Cabinet 15 › Drawer F
Heavy resorption features
Groundmass is glassy. Feldspars in hand sample.
-
Old Dad Mtns
California
Old Dad Mtns, Amboy
Latitude: 34.7°
Longitude: -115.8°
-
Sanidine with brown glass inclusions and highly resorbed biotite with resorbed cpx rim.
2.5
plane
Resorbed sanidine and biotite
2.5
crossed
-
scan
crossed
GRD001ZT0: Sanidine (resorbed, some skeletal, some with mafic glass inclusions), plagioclase (often skeletal), biotite (smaller xtals are euhedral), occasional clinopyroxene (resorbed), orthopyroxene (resorbed), and opaques (subhedral), biotite with cpx rims. (C. Eichler)
N/A
N/A