uraninite

[ yoo-ran-uh-nahyt, -rey-nuh- ]
/ yʊˈræn əˌnaɪt, -ˈreɪ nə- /

noun

a mineral, probably originally uranium dioxide, UO2, but altered by radioactive decay, and usually containing uranium trioxide, lead, radium, and helium, occurring in several varieties, including pitchblende: the most important ore of uranium.

Origin of uraninite

First recorded in 1875–80; uran(ium) + -in2 + -ite1

Words nearby uraninite

British Dictionary definitions for uraninite

uraninite
/ (jʊˈrænɪˌnaɪt) /

noun

a blackish heavy radioactive mineral consisting of uranium oxide in cubic crystalline form together with radium, lead, helium, etc: occurs in coarse granite. Formula: UO 2

Word Origin for uraninite

C19: see uranium, -in, -ite 1