Coarse Gabbro, Grenville, Quebec Gabbro is a coarse-grained, dark-colored, intrusive igneous rock. It is phaneritic (coarse-grained), mafic intrusive

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Coarse Gabbro, Grenville, Quebec Gabbro is a coarse-grained, dark-colored, intrusive igneous rock. It is phaneritic (coarse-grained), mafic intrusive igneous rock formed from the slow cooling of magnesium-rich and iron-rich magma into a holocrystalline mass.

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Keywords: coarse, coarse-grained, composition, cooling, feldspar, formation, gabbro, grenville, high-temperature, holocrystalline, igneous, intrusive, iron-rich, mafic, magma, magnesium-rich, mineral, phaneritic, plagioclase, plutonic, pyroxene, pyroxenes, quebec, rock, slow, specimen, texture