Polarised LM of grain diorite in thin section

Polarised LM of grain diorite in thin section

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Credit: ALFRED PASIEKA/SCIENCE PHOTO LIBRARY

Caption: Grain diorite. Polarised light micrograph of a sample of grain diorite in thin section. Diorite is an intrusive igneous rock, found on the margins of granite batholiths. It contains plagioclase anorthite (less than 50%, by definition) and hornblende, often with accessory inclusions of magnetite, ilmenite or quartz. The colour is an overall dark grey, with a medium to coarse grain. Its main use is as a building stone. Magnification x6 at 6x7cm size. Magnification: x11 at 5x4 inch size.

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Keywords: diorite, earth science, geological, geology, grain, grain diorite, igneous rock, light micrograph, plm, rock, rocks, type

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