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San Marcos Gabbro Coarse Norite Variety
Field Collector: Esper Signius Larsen Jr.
Place Collected:Near Perris, CA Elisnore Quadrangle, Southern California
Object number: ROC21759
DescriptionDark grey-blue medium grained (1-5 mm) plutonic igneous rock consisting of 52% plagioclase, 16% biotite, 10% quartz, 9% hypersthene (orthopyroxene), 8% augite (clinopyroxene), 3% hornblende, and 2% Fe-ore (magnetite and/or hematite) according to Larsen (1948).
In Collection(s)