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 Earths 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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Vincent Van Gogh’s Starry Night is one of the most renowned scenic masterpieces. Other famous landscape artists and photographers include Georgia O'Keeffe, Ansel Adams, and Claude Monet.