An isometric mineral, UO2 , commonly impure with actinide and lanthanide rare earths, radium, helium, and zirconium; strongly radioactive; metamict; generally black; sp gr, 10.9; in pegmatites and veins with lead, tin, and copper minerals; a source of uranium called pitchblende where massive and metamict. See also: pitchblende Syn: ulrichite; coracite.
Source: Dictionary of Mining, Mineral, and Related Terms











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