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Indian Mountain Granodiorite
Field Collector: Esper Signius Larsen Jr.
Place Collected:Near Lancaster Mountain, near Pala CA, San Luis Rey Quadrangle, CA
Object number: ROC21677
DescriptionPlutonic, fine-grained (majority of grains ≤ 1 mm) igneous rock that is light tan on a fresh surface and tan-grey on a weathered surface. Consists of ~35% white plagioclase, 35% light-grey quartz, 28% light-tan K-feldspar, and 2% black biotite.
In Collection(s)