carnotite

noun Mineralogy.

1. a yellow, earthy, hydrous potassium uranium vanadate: an ore of uranium.

noun

1. a radioactive yellow mineral consisting of hydrated uranium potassium vanadate: occurs in sedimentary rocks and is a source of uranium, radium, and vanadium. Formula: K 2 (UO 2) 2 (VO 4) 2 .3H 2 O