Autunite

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).