Olivine Gabbro, Plutonic, Grenville, Quebec A coarse-grained plutonic rock composed essentially of calcic plagioclase, pyroxene and iron oxides.
Gabbro is a phaneritic (coarse-grained), mafic intrusive igneous rock formed from the slow cooling of magnesium-rich and iron-rich magma into a holocrystalline mass deep beneath the Earth's surface.
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Keywords: augite, calcic, coarse-grained, gabbro, grenville, iron, olivine, oxides, plagioclase, plutonic, pyroxene, quebec, rock
