Mineral precipitate in agate

Mineral precipitate in agate

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This image is part of the feature Rock Art

Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: 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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Keywords: agate, chalcedony, cryptocrystalline, cut, geological, geology, impurity, maganese oxide, mineral, polished, quartz, rock, sectioned, silica, stone

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