autunite

noun

au·​tun·​ite ō-ˈtə-ˌnīt  ˈȯ-tə- 

: a radioactive usually lemon-yellow calcium phosphate mineral that occurs in tabular crystals and in scales and that is an ore of uranium

Word History

Etymology

Autun (town in Saône-et-Loire, France, near which the mineral was found) + -ite entry 1

First Known Use

circa 1852, in the meaning defined above