Carnotite
Carnotite is a mineral with the chemical formula K
2(UO
2)
2(VO
4)
2.3H
2O. 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.