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Cross section of blue agate, a type of chalcedony

Cross section of blue agate, a type of chalcedony

E425/0557

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Credit

GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY

Caption

Polished blue agate. Close up surface of a polished slice of blue agate. The bands represent the edges of successive layers of deposition during the formation of the crystal. Agate is a type of chalcedony, which itself is a microcrystalline variety of the mineral quartz (silicon oxide). Agate is formed by precipitation from watery solutions within cavities in lava rocks. The presence of impurities can give a wide range of colours which can be regularly distributed in regular bands or zones, in clouds or in dendritic (branching) forms. This sample was found in Brazil.

Release details

Model release not required. Property release not required.

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