Mineral precipitate in agate. Patterns in agate, a form of chalcedony, a cryptocrystalline variety of quartz. The dark patterns here are due to the pr

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Mineral precipitate in agate. Patterns in agate, a form of chalcedony, a cryptocrystalline variety of quartz. The dark patterns here are due to the presence of manganese oxide as an impurity.

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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Keywords: agate, chalcedony, cryptocrystalline, cut, geological, geology, impurity, maganese, mineral, oxide, polished, quartz, rock, sectioned, silica, stone