Definitions for uraniniteyʊˈræn əˌnaɪt, -ˈreɪ nə-
This page provides all possible meanings and translations of the word uraninite
Random House Webster's College Dictionary
u•ran•i•niteyʊˈræn əˌnaɪt, -ˈreɪ nə-(n.)
a radioactive mineral, uranium dioxide, UO2, usu. found mixed with its decay products: the primary ore of uranium.
Origin of uraninite:
1875–80; uran (ium ) + -in1+ -ite1
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
Any of several brownish-black forms of uranium dioxide, UO, (especially pitchblende) that is the chief ore of uranium; it is isomorphous with thorianite.
a mineral consisting chiefly of uranium oxide with some lead, thorium, etc., occurring in black octahedrons, also in masses with a pitchlike luster; pitchblende
Uraninite is a radioactive, uranium-rich mineral and ore with a chemical composition that is largely UO2, but also contains UO3 and oxides of lead, thorium, and rare earth elements. It is most commonly known as pitchblende. The mineral has been known at least since the 15th century from silver mines in the Ore Mountains, on the German/Czech border. The type locality is the town of Jáchymov, on the Czech side of the mountains, where F.E.Brückmann described the mineral in 1727. Pitchblende from the Johanngeorgenstadt deposit in Germany was used by M. Klaproth in 1789 to discover the element uranium. All uraninite minerals contain a small amount of radium as a radioactive decay product of uranium. Uraninite also always contains small amounts of the lead isotopes 206Pb and 207Pb, the end products of the decay series of the uranium isotopes 238U and 235U respectively. Small amounts of helium are also present in uraninite as a result of alpha decay. Helium was first found on Earth in uraninite after having been discovered spectroscopically in the Sun's atmosphere. The extremely rare element technetium can be found in uraninite in very small quantities, produced by the spontaneous fission of uranium-238.
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