carnotite

carnotite

[kahr-nuh-tahyt]
noun Mineralogy.
a yellow, earthy, hydrous potassium uranium vanadate: an ore of uranium.

Origin:
1895–1900; named after A. Carnot (died 1920), French mining official; see -ite1

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carnotite (ˈkɑːnəˌtaɪt)
 
n
a radioactive yellow mineral consisting of hydrated uranium potassium vanadate: occurs in sedimentary rocks and is a source of uranium, radium, and vanadium. Formula: K2(UO2)2(VO4)2.3H2O
 
[C20: named after A. Carnot (died 1920), French inspector general of mines]

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Encyclopedia Britannica
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carnotite

radioactive, bright-yellow, soft and earthy vanadium mineral that is an important source of uranium. A hydrated potassium uranyl vanadate, K2(UO2)2(VO4)23H2O, pure carnotite contains about 53 percent uranium, 12 percent vanadium, and trace amounts of radium. It is of secondary origin, having been formed by alteration of primary uranium-vanadium minerals. It occurs chiefly with tyuyamunite (its calcium analogue) in sandstone, either disseminated or locally as small pure masses, particularly around fossil wood

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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