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Quartz latite porphyry
Field Collector: Esper Signius Larsen Jr.
Place Collected:Near Domenigoni Valley, Elsinore Quadrangle, CA
Object number: ROC21713
DescriptionPorphyritic igneous rock with a medium-light-grey groundmass and white phenocrysts and streaks of biotite. Consists of ~15 white plagioclase phenocrysts (1-3 mm), 15% biotite streaks (streaks ≤ 2 cm, individual crystals < 1 mm), and 60% light grey groundmass. The biotite streaks are subparallel, probably as a result of flow.
In Collection(s)