Rhyolitic geode

Rhyolitic geode

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Rhyolitic geode. Cut surface of a geode displaying the host rock rhyolite (green), chalcedony (blue- white) and haematite (red). Geodes form when a hollow in a rock becomes filled with mineral crystals that grow inward to the centre of the hollow. Rhyolite is a volcanic rock formed by the cooling of lava on the Earth's surface. Chalcedony is a term for many cryptocrystalline quartz (silicon dioxide) gemstones, including agate. The colours are derived from impurities in the mineral. Haematite is a form of iron oxide. This geode came from the Esterel region on the Mediterranean coast in France.

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Keywords: chalcedony, cryptocrystalline, crystalline, cut, gemstone, geode, haematite, horizontal, host rock, impure, impurities, lithophyses, mineral, natural, polished, quartz, rhyolite, rhyolitic agate, rocks, section, sectioned, semi-precious, silicon dioxide, sliced, stone, stones, surface

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