Dolerite rock crystals, polarised LM

Dolerite rock crystals, polarised LM

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Credit: ALFRED PASIEKA/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. Horizontal object size of this section: 3mm.

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Keywords: basalt plm, basaltic, color, colour, colourful, colours, cross polarised, cross-polarised, cross-polarized, crossed nichols, crystal, crystalline, crystals, deformation, deformed, dolerite, earth science, folded, folding, geological, geology, light micrograph, light microscope, lm, metamorphic, mica schist, micaceous, mineral, mineralogy, minerals, multicoloured, polarised light micrograph, polarised light microscopy, polarized, polarized light micrograph, polarized light microscopy, quartz, rock, rocks, schistosity, section, sectioned

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