Gabbro |
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 GabbroIntrusive igneous rock of mafic composition.Medium-to-coarse-grained dark crystalline rock composed of biotite, hornblende, pyroxene, and plagioclase feldspar. Late Cretaceous, Western Peninsular Ranges gabbroic intrusive belt. From Pamo Canyon area near Ramona, CA. |
| https://gotbooks.miracosta.edu/rocks/igneous/13.html | 2/2/2021 |