Uraninite

[juә'ræninait]

Definition

(noun.) a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore.

Editor: Sidney--From WordNet

Definition

(n.) A mineral consisting chiefly of uranium oxide with some lead, thorium, etc., occurring in black octahedrons, also in masses with a pitchlike luster; pitchblende.

Inputed by Billy