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Gabbro
Field Collector: Esper Signius Larsen Jr.
Place Collected:Near Black Mountain? La Jolla Quadrangle, Southern California
Object number: La J 1
DescriptionDark grey-blue medium grained (1-5 mm) plutonic igneous rock consisting of dark grey plagioclase (2-4 mm), black augite crystals (2-4 mm) many of which are chloritized.
In Collection(s)