Autunite

Autunite

Autunite (hydrated calcium uranyl phosphate) with formula: Ca(UO2)2(PO4)2·10-12H2O is a yellow - greenish fluorescent mineral with a hardness of 2 - 2½. Autunite crystallizes in the tetragonal system and often occurs as tabular square crystals. Due to the moderate uranium content of 48.27% it is radioactive and also used as uranium ore. If the mineral dries out, it converts to meta-autunite-I, which can turn into meta-autunite-II after heating. These two subsequent minerals are very rare in nature. For scientific studies it is recommended to store the mineral in a sealed container to minimize the water loss. Museums are known to have covered the mineral with lacquer to avoid drying of the mineral.Autunite was discovered in 1852 near Autun, France.

External links

* [http://webmineral.com/data/Autunite.shtml Webmineral]
* [http://mineral.galleries.com/minerals/phosphat/autunite/autunite.htm Mineral Galleries]
* [http://www.mindat.org/min-433.html Mindat]


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Look at other dictionaries:

  • Autunite — Catégorie VIII : phosphates, arséniates, vanadates[1] Autunite sur granite Les Oudots France …   Wikipédia en Français

  • autunite — [ otynit ] n. f. • 1866; de Autun, ville française ♦ Minér. Phosphate naturel d uranium et de calcium. ● autunite nom féminin Uranophosphate naturel de calcium se présentant en cristaux tabulaires et qui est un minéral d altération des gisements… …   Encyclopédie Universelle

  • Autunite — Au tun*ite, n. [From Autun, France, its locality.] (Min.) A lemon yellow phosphate of uranium and calcium occurring in tabular crystals with basal cleavage, and in micalike scales. H., 2 2.5. Sp. gr., 3.05 3.19. [Webster 1913 Suppl.] …   The Collaborative International Dictionary of English

  • autunite — [ô′tən īt΄] n. [after Autun, town in France + ITE1] a hydrous, radioactive, tetragonal mineral, Ca(UO2) 2 (PO4) 2·10 12H2O: it is an ore of uranium …   English World dictionary

  • autunite — otenitas statusas T sritis chemija apibrėžtis Mineralas. formulė Ca[UO₂|PO₄]₂·(8–12)H₂O atitikmenys: angl. autunite rus. отенит; отунит …   Chemijos terminų aiškinamasis žodynas

  • autunite — noun Etymology: Autun, town in France Date: circa 1852 a radioactive usually lemon yellow calcium phosphate mineral that occurs in tabular crystals and in scales and that is an ore of uranium …   New Collegiate Dictionary

  • autunite — /awt n uyt , oh tun uyt/, n. a yellow mineral, a hydrous calcium uranium phosphate, CaU2P2O12·8H2O, occurring in crystals as nearly square tablets: a minor ore of uranium. [1850 55; named after Autun, city in E France near source of supply; see… …   Universalium

  • autunite — noun A yellow mineral with tetragonal crystals, Ca(UO)(PO)·10 12HO …   Wiktionary

  • autunite — au·tu·nì·te s.f. TS mineral. minerale radioattivo di colore giallo, costituito da fosfato di calcio e uranio, cristallino, che si presenta in lamine {{line}} {{/line}} DATA: 1881. ETIMO: der. di Autun, nome di una cittadina della Francia, con 2… …   Dizionario italiano

  • autunite — {{hw}}{{autunite}}{{/hw}}s. f. Minerale dell uranio …   Enciclopedia di italiano

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