'Hornblende Gabbro, Massachusetts'

'Hornblende Gabbro, Massachusetts'

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Caption: Gabbro is a coarse grained, equigranular igneous rock composed mainly of plagioclase feldspar (labradorite or bytownite) and orthoclase, a pyroxene such as augite, sometimes also nepheline and olivine, and a large percentage of hornblende (in hornblende gabbro). Rocks of this type are sometimes known as essexite. Gabbro forms as a result of the slow and undisturbed cooling of magma (molten rock) deep underground.

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Keywords: arem collection, cooling history, equigranular, essexite, gabbro, geologic feature, geological, geology, grain size, grains, hornblende, hornblende gabbro, igneous, massachusetts, mineralogy, nepheline, orthoclase, properties, rock, rocks, salem neck, specimen, texture

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