Dolerite, Igneous, Saco, Maine Dolerite is a dark, medium-grained igneous rock, typically with ophitic texture, containing plagioclase, pyroxene, and

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Dolerite, Igneous, Saco, Maine Dolerite is a dark, medium-grained igneous rock, typically with ophitic texture, containing plagioclase, pyroxene, and olivine. It typically occurs in dikes and sills.

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Photo credit: © Phil Degginger / Alamy / Afripics
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Keywords: basaltic, composition, cooling, diabase, dolerite, feldspar, holocrystalline, igneous, intrusive, mafic, maine, medium-grained, microgabbro, mineral, olivine, plagioclase, pyroxene, rock, saco, slow, specimen, subvolcanic, texture, type