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