carnotite

noun
car·no·tite | \ˈkär-nə-ˌtīt \

Definition of carnotite 

: a yellow to greenish-yellow mineral consisting of a radioactive hydrous vanadate of uranium and potassium that is a source of radium and uranium

First Known Use of carnotite

1899, in the meaning defined above

History and Etymology for carnotite

French, from M. A. Carnot †1920 French inspector general of mines

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The first known use of carnotite was in 1899

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