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Fine-grained granodiorite
Field Collector: Esper Signius Larsen Jr.
Place Collected:My best guess is the San Marcos area, San Luis Rey Quadrangle, Southern California
Object number: SLR 307
DescriptionVery light grey, fine-grained (< 1 mm) plutonic igneous rock with heterogeneous patches of black biotite flecks. The majority of the grains are < 1 mm white-grey plagioclase and quartz with a sugary texture.
In Collection(s)