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carnotite

[kahr-nuh-tahyt] /ˈkɑr nəˌtaɪt/
noun, Mineralogy
1.
a yellow, earthy, hydrous potassium uranium vanadate: an ore of uranium.
Origin
1895-1900
1895-1900; named after A. Carnot (died 1920), French mining official; see -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for carnotite

carnotite

/ˈkɑːnəˌtaɪt/
noun
1.
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
Word Origin
C20: named after A. Carnot (died 1920), French inspector general of mines
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for 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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