Autunite
Autonite (Hydrated Calcium Uranyl Phosphate) is a yellow - greenish fluorescent mineral with a Hardness of 2 - 2½. Due to the high content in uranium, it is radioactive and also used as uranium ore. If the mineral dries out, it converts to meta-autunite-I, which can turn into meta-autunite-II after heating. These two subsequent mireals are very rare in nature. For scientific studies it is recommended to store the mineral in a seale dcontainer to minimize the water loss. Museums are known to have covered themineral with lacquer to avoid drying of the mineral.
See also: List of minerals
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