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San Marcos Gabbro
Field Collector: Esper Signius Larsen Jr.
Place Collected:San Luis Rey Quadrangle, probably in the San Marcos Mountains Southern California
Object number: ROC21801
DescriptionBlack and white medium grained (1-5 mm) plutonic igneous rock consisting of ~60% white-light grey plagioclase (1-2 mm) and 38% black hornblende (up to 5 mm) and 2 % green pyroxene, maybe diopside.
In Collection(s)