| 1. | Autunite crystallizes in the orthorhombic system and often occurs as tabular square crystals.
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| 2. | Autunite was discovered in 1852 near Autun, France.
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| 3. | It is especially closely associated with torbernite, but is also found amongside autunite, meta-autunite and uraninite.
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| 4. | It is especially closely associated with torbernite, but is also found amongside autunite, meta-autunite and uraninite.
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| 5. | They could be a defining constituent, such as uranium in uraninite, autunite, and carnotite, or as trace impurities.
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| 6. | For example, Autunite can form beautiful crystals, but no-one would consider it to be anything like a gemstone.
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| 7. | The chemical formula of torbernite is similar to that of autunite in which a Cu 2 + cation replaces a Ca 2 +.
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| 8. | It is found in many minerals including uraninite ( most common uranium ore ), autunite, uranophane, torbernite, and coffinite.
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| 9. | The uranium was present as autunite at the contact between a rhyolite dike and tuffs of the Oligocene-Miocene John Day Formation.
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| 10. | If the mineral dries out, it converts to meta-autunite-I, which can turn into meta-autunite-II after heating.
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