uraninite: see pitchblende pitchblende (pĭch`blĕnd'), dark, lustrous, heavy mineral, a source of radium and uranium.
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Uranium dioxide (UO2), a major oxide mineral of uranium. Uraninite is radioactive and usually forms black, gray, or brown crystals that are moderately hard and generally opaque. The elements uranium and radium were first extracted from uraninite ore from what is now the Czech Republic. It has also been mined in Germany and Canada, and in the Colorado Plateau (U.S.). See also pitchblende.
uraninite [′yu̇r·ə·nə‚nīt]
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uraninite
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Uraninite in pitchblende from Great Bear Lake, Northwest Territories, embedded (for display) in a …
(credit: Courtesy of the Field Museum of Natural History, Chicago; photograph, John H. Gerard)
uraninite [′yu̇r·ə·nə‚nīt]
(mineralogy)
UO2A black, brownish-black, or dark-brown radioactive mineral that is isometric in crystallization; often contains impurities such as thorium, radium, cerium, and yttrium metals, and lead; the chief ore of uranium; hardness is 5.5-6 on Mohs scale, and specific gravity of pure UO2is 10.9, but that of most natural material is 9.7-7.5. Also known as coracite; ulrichite.
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