Dolerite rock crystals, light micrograph

Dolerite rock crystals, light micrograph

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Credit: HERVE CONGE, ISM/SCIENCE PHOTO LIBRARY

Caption: Dolerite rock crystals. Polarised light micrograph of a sample of dolerite, mostly comprising large crystals (blue) in a finer-grained rock matrix. The colours seen, and the physical appearance of the rock, depend on the exact mineral content of the rock and how the rock was formed. Dolerite is a coarse-grained basaltic rock, meaning it is similar in composition to the basalts. Like basalt it is an igneous rock produced by volcanoes, and it is also a very common rock. Magnification: x6 when printed 10cm wide.

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Keywords: basaltic, crystal, crystalline, crystallography, crystals, dolerite, earth science, geological, geology, igneous, light micrograph, light microscope, lm, mineral science, petrography, petrology, polarized light micrograph, rock, rocks, slice, volcanic

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