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San Marcos Gabbro
Field Collector: Esper Signius Larsen Jr.
Place Collected:Near La Cienga Elsinore Quadrangle, Southern California
Object number: ROC21762
DescriptionSalt-and-pepper colored medium-grained igneous rock consisting of ~60% white-grey plagioclase (~1-2 mm), 30% black hornblende (~1 mm), and 10% grey quartz (~1 mm).
In Collection(s)