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Santiago Peak Volcanic Mafic Intrusive
Field Collector: Esper Signius Larsen Jr.
Place Collected:Probably off of Tenaja Truck Trail in the Santa Ana Mountains Elsinore Quadrangle, Southern California.
Object number: ROC21741
DescriptionDark grey-black medium-grained (~1-5 mm) plutonic igneous rock consisting of dark-grey plagioclase and black amphiboles and pyroxenes.
In Collection(s)