GRD000VS0
I-32
Andesite
Cenozoic › Neogene › Miocene
5.3
-
23.0
1
Ritter 154 › Cabinet 16 › Drawer A
resorption
Porphyritic. White sanidine in dark grey matrix.
-
Van Winkel Mtns
California
Van Winkel Mtns, 30 mi NE of Amboy
Latitude: 34.99°
Longitude: -115.29°
-
Resorbed amphibole and subhedral feldspar with small crystal inclusions. Glomerocryst.
2.5
plane
Tartan twinning in feldspar. Glomerocryst.
2.5
crossed
Broken slide
scan
crossed
GRD000VT0: (broken slide) Sanidine (resorption, concentric oscillatory zonation, polysynthetic twinning), plagioclase, subhedral resorbed amphibole, biotite, matrix of finer crystals. (C. Eichler)
N/A
N/A