DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Jasper, cut and polished surface. Jasper is a form of chalcedony, a type of cryptocrystalline quartz (silica, SiO2) mineral. The dramatic colours are derived from impurities in the rock, mostly iron oxide. This sample is from Roy Hill in Western Australia.
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