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Geode interior

Geode interior

E425/0823

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Credit

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

Caption

Geode interior. Quartz crystals (centre) inside a geode. A geode forms when layers of the mineral silica (silicon dioxide) precipitate from liquid onto the inside of hollows in rock. The silica has an outer layer of chalcedony (amorphous or non- crystalline silica), with the layers becoming more crystalline towards the centre. Quartz is the crystalline form of silica. This geode has been cut open to reveal this crystalline interior. A gradual gradation from the outer chalcedony layers (orange) to the inside is seen. The colour is due to impurities in the silica.

Release details

Model release not required. Property release not required.

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