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Basalt
Field Collector: Esper Signius Larsen Jr.
Place Collected:Near Murietta CA, San Luis Rey Quadrangle, Southern California
Object number: ROC21720
DescriptionDark grey volcanic igneous rock with a few vesicles. Mineral modes given by Larsen (1948) are 69% plagioclase, 17% pyroxene, 11% olivine, and 3% ore.
In Collection(s)