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Dacite
Field Collector: Esper Signius Larsen Jr.
Place Collected:San Luis Rey Quadrangle, Southern California
Object number: SLR 697
DescriptionLight grey volcanic rock with rust-colored weathering. Few plagioclase phenocrysts are visible (~1-2 mm) and even fewer dark minerals that may be amphibole (~4 mm).
In Collection(s)