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n. A yellow ore of uranium and radium with composition K(UO2)2(VO4)2·3H2O.

n. A yellow mineral that is a potassium uranyl vanadate that is a major ore or uranium, with the chemical formula K2(UO2)2(VO4)2·3H2O.

n. A more or less impure hydrated vanadate of uranium and potash, occurring somewhat abundantly in Montrose county and elsewhere in Colorado: found as a yellow crystalline powder or in loosely coherent masses. It contains radium and is said to be highly radio-active.

n. a yellow radioactive mineral; an ore of uranium and radium and vanadium

"But the discovery in 1924 of a large pitchblende deposit in the Belgian Congo provided a more dependable radium supply and the interest in American carnotite fizzled."

uranium ore