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A radioactive mineral consisting of hydrated uranium potassium vanadate, K2(UO2)2(VO4)2.nH2O. It varies in colour from bright yellow to lemon- or greenish-yellow. It is a source of uranium, radium, and vanadium. The chief occurrences are in the Colorado Plateau, USA; Radium Hill, Australia; and Katanga, Zaïre.

Subjects: Earth Sciences and Geography — Chemistry.

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