The Carnotite reference article from the English Wikipedia on 24-Apr-2004
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Carnotite is a mineral with the chemical formula K2(UO2)2(VO4)2.3H2O. Carnotite has crystals with a monoclinic habit, it has a hardness of about 2, and a bright yellow color.

The high Uranium content makes carnotite an important uranium ore and also radioactive. It is deposited from vanadium and uranium one sedimentary rocks.