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Twin Peaks Aplite Granite
Field Collector: Esper Signius Larsen Jr.
Place Collected:Near Poway CA, San Luis Rey Quadrangle, Southern CA
Object number: ROC21682
DescriptionPlutonic, fine-grained (majority of grains ≤ 1 mm) igneous rock. Salt and pepper on a fresh surface with some faint rust-colored patches and grey on a weathered surface. Consisting of 30% white plagioclase [≤ 1 mm (5 mm rare)], 30% light-grey quartz, 25% very light pink-tan K-feldspar, and 15% black biotite flecks.
In Collection(s)