/al"yeuh nuyt'/, n.
a mineral, a hydrous sulfate of potassium and aluminum, KAl3(SO4)2(OH)6, commonly occurring in fine-grained masses. Also called alumstone /al"euhm stohn'/.
[1865-70; < F alun ( < L alumen ALUM1) + -ITE1]

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also called  Alum Stone,  
 a widespread rock-forming sulfate mineral that occupies pockets or seams in volcanic rocks such as rhyolites, trachytes, and andesites, where it presumably formed through their chemical reaction with escaping sulfurous vapours. It has been used as a source of potash (during World War I) and as a source of alumina (during World War II); in Europe it was once used extensively to make potash alum, and it has been mined for this purpose since the 15th century. Large deposits exist near Beregovo, Ukraine; Almería, Spain; and Bullah Delah in New South Wales, Australia. For chemical formula and physical properties, see sulfate mineral (table).

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Universalium. 2010.

Look at other dictionaries:

  • Alunite — Alunite[1] Catégorie VII : sulfates, sélénates tellurates, chromates, molybdates, tungstates[2] …   Wikipédia en Français

  • Alunite — Alunite, or alumstone, is a mineral that was first observed in the 15th century in Monti della Tolfa, north to Rome, where it was mined for the manufacture of alum. First called aluminilite by J.C. Delametherie in 1707, this name was contracted… …   Wikipedia

  • alunite — [ alynit ] n. f. • 1824; de alun ♦ Sulfate basique double hydraté d aluminium et de potassium que l on trouve dans la nature, utilisé pour la production d alun et de sulfate d aluminium. ● alunite nom féminin (de alun) Sulfate d aluminium naturel …   Encyclopédie Universelle

  • Alunite — Al u*nite, n. (Min.) Alum stone. [1913 Webster] …   The Collaborative International Dictionary of English

  • alunite — [al′yo͞o nīt΄, al′yənīt΄] n. [Fr < alun < L alumen, ALUM1] a semihard, hydrous mineral, KAl3 (SO4) 2 (OH) 6, used to produce alum …   English World dictionary

  • alunite — a·lu·nì·te s.f. TS mineral. minerale di colore bianco o rossiccio costituito da solfato idrato di alluminio e potassio {{line}} {{/line}} DATA: 1845. ETIMO: dal fr. alunite, der. di alun allume …   Dizionario italiano

  • alunite — alūnitas statusas T sritis chemija apibrėžtis Mineralas. formulė KAl₃[(OH)₆|(SO₄)₂] atitikmenys: angl. alunite rus. алунит …   Chemijos terminų aiškinamasis žodynas

  • alunite — noun Etymology: French, from alun alum Date: 1868 a mineral that consists of a hydrous potassium aluminum sulfate and occurs in massive form or in rhombohedral crystals …   New Collegiate Dictionary

  • alunite — noun A gray, water soluble mineral, potassium aluminium sulphate; the natural source of alum, KAl(SO)(OH) …   Wiktionary

  • alunite — (a lu ni t ) s. f. Terme de minéralogie. Roche d où on tire l alun du commerce …   Dictionnaire de la Langue Française d'Émile Littré

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