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A complex brownish-black mineral, UO2, forming the chief ore of uranium and containing variable amounts of radium, lead, thorium, and other elements. It is isomorphous with thorianite.

[German Uranin (from New Latin ūranium, uranium; see uranium) + -ite.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Minerals) a blackish heavy radioactive mineral consisting of uranium oxide in cubic crystalline form together with radium, lead, helium, etc: occurs in coarse granite. Formula: UO2
[C19: see uranium, -in, -ite1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(yʊˈræn əˌnaɪt, -ˈreɪ nə-)

a radioactive mineral, uranium dioxide, UO2, usu. found mixed with its decay products: the primary ore of uranium.
[1875–80; uran (ium) + -in1 + -ite1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.uraninite - 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
atomic number 92, uranium, U - a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
uranium ore - any ore from which uranium can be extracted
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
(Uraninite) and secondary mierals such as tyuyamunite, carnotite are commonly existed and enriched by water at places in cavities in Vihowa Group (Oligocene Chittarwata, Vihowa, Litra and Chaudhwanan formations) and may be hosted in coal and sandstone bearings formations.
England GL, Rasmussen B, Krapez B, Groves DI (2001) The origin of uraninite, bitumen nodules, and carbon seams in Witwatersrand golduranium-pyrite ore deposits, based on a Permo-Triassic analogue.
In the case of felsic melt-aqueous-phase separation relevant for magmatic hydrothermal deposits (e.g., Rijssing alaskites from Namibia [23] and Kvanefjeld deposit in the Ilimaussaq intrusion [24]), high-temperature experiments show that the partitioning coefficient of U between aqueous fluid and melt ([K.sub.D] = [c.sub.fluid]/[c.sub.melt]) strongly increases with increasing HF content at 750[degrees]C [25], as does the solubility of uraninite in uraninite-melt-fluid systems (up to twenty times more U than in chloride solution with the same salinity at 770[degrees]C [26]).
Uranium is found in hundreds of minerals, including uraninite (the most common uranium ore), carnotite, autunite, uranophane, torbernite and coffinite.
Devoting her attention to the mineral, pitchblende, uraninite ore, she reasoned that its emission of rays could be explained only by the presence in the ore of an unknown substance or substances.
Basically in Pakistan uranium is deposited in three types Uraninite, Pitchblende and Coffinite.
UO2, also known as urania or uranous oxide, is an oxide of uranium, and is a black, radioactive, crystalline powder that naturally occurs in the mineral uraninite. It is used in nuclear fuel rods in nuclear reactors.
Fluorapatite, zircon, Nb-Ta-Ti oxides, xenotime-(Y), monazite-(Ce), uraninite and coffinite are common accessory minerals.
UO2, also known as urania, is a radioactive, crystalline powder that naturally occurs in the mineral uraninite, used in nuclear fuel rods in nuclear reactors.
The XRD analysis also registered the presence of dolomite and the highest peaks of pyrite or uraninite were observed in this section, coincident with the black shale levels with high U content.
The high tenor and speed of the uranium extraction suggest the Theseus mineralisation consists predominantly of uraninite and coffinite and is readily available for leaching.