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Basalt
Field Collector: Esper Signius Larsen Jr.
Place Collected:San Luis Rey Quadrangle, Southern California
Object number: SLR L118
DescriptionDark grey volcanic igneous rock. On a weathered surface there appears to be a few vesicles. In thin section there are few plagioclase crystals that get up to ~0.5 mm, but the rest in the ground mass are ~0.1 or less. There is trace amounts of biotite.
In Collection(s)