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FluoriteThis delightful cube is a crystal of fluorite, the mineral made of calcium and fluorine. The

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Multiflavoured candy crystalColour zoning in minerals is a complex business, reflecting changes in t

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Spotlight on the gem world: Glowing diamonds.The Hope diamond shown here is one of the most famous d

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Blue Dragon LavaThe Craters of the Moon volcanic field in Idaho represents large outpourings of basa

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Most of Earth gets a nameThis is a section of the Tenham meteorite, which fell in Queensland Austral

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