Cut and polished jasper

Cut and polished jasper

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Cut and polished jasper. Detail of a polished slab of 'Ocean Jasper', a type of chalcedony (silica) that was precipitated in a volcanic (rhyolitic) environment. This particular variety is from northern Madagascar. A void, left after the precipitation of the chalcedony, was later filled with crystalline quartz (blue), a process also seen in geodes and other agates.

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Keywords: chalcedony, close-up, crystal, crystalline, crystallised, crystals, cut, detail, earth science, filled, geological, geology, layer, layers, mineral, mineralogy, minerals, northern madagascar, ocean jasper, pattern, patterns, polished, precipitated, precipitation, quartz, rhyolitic, rock, rocks, section, sectioned, void, volcanic

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