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Hornblende Gabbro
Field Collector: Esper Signius Larsen Jr.
Place Collected:San Luis Rey Quadrangle, Southern California
Object number: ROC13785
DescriptionBlack metamorphic rock that appears to be a contact between two different rocks. The contact between them is abrupt. One rock is a fine-grained black metamorphic rock with a few visible stetched out lines of white quartz. The other rock is a honblendite with hornblende crystals up to 4 cm long.
In Collection(s)