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Caption: Diorite. Diorite is a grey to dark grey intermediate intrusive igneous rock composed principally of plagioclase feldspar (typically andesine), biotite, hornblende, and/or pyroxene. It may contain small amounts of quartz, microclne and olivine. This sample has a prophyritic texture, porphyry being a general term for indicating igneous rocks that consist of large grains or crystals in a fine grained matrix. In this sample there is a matrix (light grey) of feldspar (andesine), containing grains of pyroxene and hornblende (dark grey).

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Keywords: black background, close-up, crystallography, cut out, cut outs, cut-out, cut-outs, cutout, cutouts, detail, diorite, earth science, feldspar, geological, geology, grain, grains, hornblende, igneous, intrusive, large grained, large-grained, matrix, mineral, mineralogy, plagioclase, porphyrite, porphyritic, porphyry, pyroxene, rock, rocks, rocky, sample, specimen, still life, still-life, volcanic

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