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Caption: Basalt. Close-up of a thin section of basalt (black). Basalt is a common and widespread dark-coloured igneous rock. It forms as a result of the cooling of lava flows or small intrusions and is typically black. In this image, large coloured crystals (phenocrysts) appear embedded in the fine-grained basalt matrix. The size of a phenocryst depends on the rate at which it was cooled out of the magma as the basalt formed - the larger the crystals the slower the process. Magnification x5 when printed at 10 centimetres wide.

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Keywords: basalt, basaltic, close-up, crystal, crystalline, crystals, detail, earth science, fine grained, fine-grained, geological, geology, grain, grains, igneous, inclusion, inclusions, magma, matrix, mineral, mineralogical, mineralogy, minerals, phenocryst, phenocrysts, rock, rocks, sample, section, sectioned, specimen, texture

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