carnotite

/kahr"neuh tuyt'/, n. Mineral.
a yellow, earthy, hydrous potassium uranium vanadate: an ore of uranium.
[1895-1900; named after A. Carnot (d. 1920), French mining official; see -ITE1]

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 radioactive, bright-yellow, soft and earthy vanadium (vanadium processing) mineral that is an important source of uranium (uranium processing). A hydrated potassium uranyl vanadate, K2(UO2)2(VO4)2·3H2O, pure carnotite contains about 53 percent uranium, 12 percent vanadium, and trace amounts of radium. It is of secondary origin, having been formed by alteration of primary uranium-vanadium minerals. It occurs chiefly with tyuyamunite (its calcium analogue) in sandstone, either disseminated or locally as small pure masses, particularly around fossil wood.

      Carnotite has provided most of the uranium production from secondary deposits; it is also mined for vanadium and radium. From 1911 to 1923, ores containing carnotite were mined in Colorado for radium. From 1937 to 1943, carnotite was again mined, primarily for vanadium. After World War II it was mined extensively in the U.S. for uranium. The greatest known concentration of carnotite deposits is in the western U.S., particularly in the Colorado Plateau area. Other deposits occur in Wyoming, South Dakota, and Pennsylvania. Carnotite has been found in small quantities at many localities throughout the world; commercial deposits outside the U.S. occur near Kokand and Ferghana in eastern Uzbekistan. For detailed physical properties, see vanadate mineral (table).

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Universalium. 2010.

Look at other dictionaries:

  • Carnotite — Catégorie VIII : phosphates, arséniates, vanadates[1] Carnotite du Colorado (États Unis) …   Wikipédia en Français

  • CARNOTITE — Vanadate hydraté d’uranium et de potassium de formule chimique: K2(UO2)2(VO4)23H2O, qui doit son nom de carnotite au savant français Marie Adolphe Carnot (1839 1920). À l’analyse chimique, elle apparaît composée de 10,4 p. 100 de K2O, de 63,4 p.… …   Encyclopédie Universelle

  • carnotite — [kär′nə tīt΄] n. [after A. Carnot (died 1920), Fr mine inspector + ITE1] a yellow, very soft, radioactive, monoclinic mineral, K2 (UO2) 2 (VO4) 2·3H2O, that is a source of uranium, radium, and vanadium …   English World dictionary

  • Carnotite — Infobox mineral name = Carnotite category = boxwidth = boxbgcolor = imagesize = 200 caption = formula = K2(UO2)2 (VO4)2·3H2O molweight = color = Yellow, Golden yellow, Greenish yellow habit = crusts, earthy masses, foliated and granular… …   Wikipedia

  • carnotite — karnotitas statusas T sritis chemija apibrėžtis Mineralas. formulė K₂[(UO₂)₂|V₂O₈]·3H₂O atitikmenys: angl. carnotite rus. карнотит …   Chemijos terminų aiškinamasis žodynas

  • carnotite — noun Etymology: French, from M. A. Carnot died 1920 French inspector general of mines Date: 1899 a yellow to greenish yellow mineral consisting of a radioactive hydrous vanadate of uranium and potassium that is a source of radium and uranium …   New Collegiate Dictionary

  • carnotite — noun A yellow mineral that is a potassium uranyl vanadate that is a major ore or uranium, with the chemical formula K(UO)(VO)·3HO …   Wiktionary

  • carnotite — car·no·tì·te s.f. TS mineral. minerale di colore giallo, costituito da vanadato idrato di potassio e uranile, utilizzato per l alto contenuto di uranio {{line}} {{/line}} DATA: 1931. ETIMO: der. di Carnot, nome del chimico e mineralogista… …   Dizionario italiano

  • carnotite — {{hw}}{{carnotite}}{{/hw}}s. f. Minerale di color giallo, da cui si ricava uranio …   Enciclopedia di italiano

  • carnotite — pl.f. carnotiti …   Dizionario dei sinonimi e contrari

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