GRD00DRS0
I-541
Diorite
Mesozoic › Jurassic
145.5
-
201.6
3
Ritter 154 › Cabinet 3 › Drawer F
Hornblende-Biotite
Fine grained Hornblende-Biotite Diorite Original description: Q diorite (tonalite), Jurassic intrusive related to Santiago Pk volcanics.
Previously used in Petrology by James Day. Midterm Laboratory at least as recently as 2017
-
California
5 miles NNW of Escondido
Latitude: 33.18°
Longitude: -117.13°
-
-
5.0
plane
Concentric zonation in plagioclase
5.0
crossed
-
scan
crossed
GRD00DRT0: 55% plagioclase (albite and polysynthetic twinning, oscillatory zonation), 30% amphibole, 5% biotite, 5% clinopyroxene, trace opaques. (J. Gee)
GRD00DRT1: 55% plagioclase (albite and polysynthetic twinning, oscillatory zonation), 30% amphibole, 5% biotite, 5% clinopyroxene, trace opaques. (J. Gee)
GRD00DRT2: 55% plagioclase (albite and polysynthetic twinning, oscillatory zonation), 30% amphibole, 5% biotite, 5% clinopyroxene, trace opaques. (J. Gee)
N/A
N/A