ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
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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