Banded texture in agate

Banded texture in agate

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Banded texture in agate. Close-up of the cut and polished surface of agate, a type of chalcedony, a cryptocrystalline variety of quartz. The bands form due to the precipitation of different mineral salts from a solution inside a hollow rock, or geode. For instance, the red bands are formed of iron oxide.

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Keywords: agate, banded, bands, chalcedony, cryptocrystalline, cut, geological, geology, iron oxide, layers, mineral, polished, quartz, rock, sectioned, semi-precious, stone, surface

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