Alunogen

Alunogen

Alunogen also called feather alum and hair salt is a colourless to white (although often coloured by impurities, like Fe substituting for Al) fibrous to needle-like aluminium sulfate mineral often found on the walls of mines and quarries as secondary mineral. It can be found in the oxidation zones of some ore deposits as well as on burning coal dumps (i.e. as the product of millosevichite hydratation).

Alunogen has the chemical formula: Al2(SO4)3·17H2O. More precise, crystallochemical formula, can be written as: [Al(H2O)6] 2(SO4)3.5H2O. The second formula shows, that H2O in the alunogen formula occurs both as ligand (coordinative form) and loosely-bounded (crystallization) from. The second form can be easily removed just by slight grinding of the mineral (by preserving the unique structure).

References

* [http://www.mindat.org/min-162.html Mindat]
* [http://webmineral.com/data/Alunogen.shtml Webmineral]


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Look at other dictionaries:

  • Alunogen — aus Almyras, Agia Varvara, Zypern Chemische Formel Al2[SO4]3 • (12+5)H2 O[1] …   Deutsch Wikipedia

  • Alunogen — A*lu no*gen, n. [F. alun alum + gen.] (Min.) A white fibrous mineral frequently found on the walls of mines and quarries, chiefly hydrous sulphate of alumina; also called feather alum, and hair salt. [1913 Webster] …   The Collaborative International Dictionary of English

  • Alunogen —   der, s, Keramohalịt, triklines Mineral der chemischen Zusammensetzung Al2[SO4]3 · 18 H2O, weiß oder gelblich, Härte nach Mohs 1,5 2, Dichte 1,77 g/cm3; als Krusten auf Braun und Steinkohlen, auch flüssig in Kohlenklüften; Zersetzungsprodukt… …   Universal-Lexikon

  • alunogen — /euh looh neuh jeuhn/, n. a mineral, hydrous sulfate of aluminum, Al2(SO4)3·18H2O, occurring as a white, fibrous crust on quarry or mine walls. [1865 70; < F alun (see ALUNITE) + O + GEN] * * * ▪ mineral       a sulfate mineral formed by sulfate… …   Universalium

  • alunogen — alunogenas statusas T sritis chemija apibrėžtis Mineralas. formulė Al₂[SO₄]₃·18H₂O atitikmenys: angl. alunogen rus. алуноген …   Chemijos terminų aiškinamasis žodynas

  • alunogen — noun An aluminium sulfate mineral often found on the walls of mines and quarries. Syn: feather alum, hair salt …   Wiktionary

  • Alunogen — Alu|no|gen der; s, e <zu ↑...gen> ein farbloses bis rötliches Mineral, Aluminiumsulfat …   Das große Fremdwörterbuch

  • alunogen — alu·no·gen …   English syllables

  • alunogen — əˈlünəjən noun ( s) Etymology: French alunogène, from alun + gène gen : a mineral consisting of a white fibrous aluminum sulfate Al2(SO4)3.18H2O frequently found on the walls of mines and quarries called also feather alum, hair salt …   Useful english dictionary

  • Liste der Minerale — Die Liste der Minerale ist eine alphabetisch geordnete Übersicht von Mineralen, Synonymen und bergmännischen Bezeichnungen. Ebenfalls aufgeführt werden hier Mineral Varietäten, Mineralgruppen und Mischkristallreihen, zu denen teilweise bereits… …   Deutsch Wikipedia

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