carnotite
noun
car·no·tite ˈkär-nə-ˌtīt 
: a yellow to greenish-yellow mineral consisting of a radioactive hydrous vanadate of uranium and potassium that is a source of radium and uranium
Word History
Etymology
French, from M. A. Carnot †1920 French inspector general of mines
First Known Use
1899, in the meaning defined above