1802Uranium ores [see Compounds 1a(a)]. 1837 J. D. Dana 372 Pitchblende. Uranius amorphus. Uncleavable Uranium-Ore.
1940 G. Gamow iii. 59 Madame Curie finally succeeded in extracting from some uranium ores (pitchblende from Bohemia) two previously unknown elements.
2008 17 Jan. 250/2 Uranyl ions were discovered shortly after uranium itself. Their reactions are crucial for the extraction of uranium ore.