Thorite crystals. Thorite ((Th,U)SiO4) is a rare neosilicate mineral that is usually strongly radioactive. It is the most common thorium containing mi

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Thorite crystals. Thorite ((Th,U)SiO4) is a rare neosilicate mineral that is usually strongly radioactive. It is the most common thorium containing mineral. It is most often found in igneous rocks. Thorite is an important ore of uranium. Samples from Arendal, Norway.

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