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autunite
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Autunite from Spokane, Wash.
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Autunite from Spokane, Wash.
Autunite from Spokane, Wash.

autunite

mineral
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phosphate mineral
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autunite, phosphate mineral, hydrated calcium and uranium phosphate [Ca(UO2)2 (PO4)2·10–12H2O], that is an ore of uranium. It forms translucent to transparent, yellow to pale-green crystals, scaly masses, or crusts in hydrothermal veins and pegmatites, where it occurs as an alteration product of uraninite. It has been found in Cornwall, Eng.; Katanga, Congo (Kinshasa); and the northwestern United States. For detailed physical properties, see phosphate mineral (table).