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Agate, artificially coloured

Agate, artificially coloured

E425/0819

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Credit

DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY

Caption

Agate, artificially coloured. Close-up of the cut and polished surface of an agate geode. Agate is a form of chalcedony, a cryptocrystalline variety of quartz. The bands are produced by the precipitation of crystals from solutions of mineral salts. The bands are often highly coloured due to the presence of impurities. In this case, however, the bands were colourless, and the blue was added using a dye bath.

Release details

Model release not required. Property release not required.

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