Basalt, thin section, polarised LM

Basalt, thin section, polarised LM

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Credit: ALFRED PASIEKA/SCIENCE PHOTO LIBRARY

Caption: Polarised light micrograph of a thin section of basalt, an igneous rock. In this image, large coloured crystals appear embedded in the fine-grained basalt matrix. Such crystals are known as phenocrysts. The size of a phenocryst depends on the rate at which it was cooled out of the magma; the larger the crystals the slower the process. Magnification x20 at 35mm size..

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Keywords: basalt, crystal, crystalline, crystals, earth science, geological, geology, igneous, inclusion, light micrograph, magma, mineral, minerals, polarised light, polarised light micrograph, rock, thin section basalt

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