Basalt rock crystals, light micrograph

Basalt rock crystals, light micrograph

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Credit: HERVE CONGE, ISM/SCIENCE PHOTO LIBRARY

Caption: Basalt rock crystals. Polarised light micrograph of a sample of basalt, showing crystals (blue) in a matrix of finer-grained rock. 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. Basalt is a volcanic rock, and is formed by cooling from lava. Magnification: x30 when printed 10cm wide.

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Keywords: basalt, crystal, crystalline, crystallography, crystals, 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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