Braunite

Braunite

Braunite is a silicate mineral containing both di- and tri-valent manganese with the chemical formula: Mn2+Mn3+6SiO12. Common impurities include iron, calcium, boron, barium, titanium, aluminium, and magnesium.

Braunite forms grey/black tetragonal crystals and has a Mohs hardness of 6 - 6.5.

It was named after a Mr. Braun of Gotha, Thuringia, Germany.

A calcium iron bearing variant, named braunite II (formula: Ca(Mn3+,Fe3+)14SiO24), was discovered and described in 1967 from Kalahari, Cape Province, South Africa.

External links

* [http://www.mindat.org/min-757.html Mindat]
* [http://www.webmineral.com/data/Braunite.shtml Webmineral]
* [http://un2sg4.unige.ch/athena/cgi-bin/minfich?s=BRAUNITE Athena mineral]


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Look at other dictionaries:

  • Braunite — Braun ite, n. (Min.) A native oxide of manganese, of dark brownish black color. It was named from a Mr. Braun of Gotha. [1913 Webster] …   The Collaborative International Dictionary of English

  • braunite — ● braunite nom féminin (de Braun, nom propre) Silicate naturel de manganèse, de formule 3Mn2O3,MnSiO3, qu on exploite comme minerai de manganèse …   Encyclopédie Universelle

  • braunite — braunitas statusas T sritis chemija apibrėžtis Mineralas. formulė Mn²⁺Mn₆⁴⁺[O₈|SiO₄] atitikmenys: angl. braunite rus. браунит …   Chemijos terminų aiškinamasis žodynas

  • braunite — /brow nuyt/, n. an ore of manganese, 3Mn2O3·MnSiO3. [1830 40; named after A. E. Braun (1809 56), German official; see ITE1] * * * …   Universalium

  • braunite — noun A silicate mineral containing divalent and trivalent manganese and forming grey black tetragonal crystals …   Wiktionary

  • braunite — braun·ite …   English syllables

  • braunite — /ˈbraʊnaɪt/ (say brownuyt) noun a mineral, manganese oxide and silicate, Mn7SiO12, an ore of manganese. {named after AE Braun, 1809–56, German archaeologist} …  

  • braunite — ˈbrau̇ˌnīt noun ( s) Etymology: Councilor Braun, 19th century German treasury official + English ite : a brittle brownish black or steel gray mineral that consists of manganese silicate and occurs massive and as tetragonal crystals (hardness 6… …   Useful english dictionary

  • Braunit — Chemische Formel Mn2+Mn3+6[O8|SiO4] Mineralklasse Silicate und Germanate 9.AG.05 (8. Auflage: VIII/B.09 03) (nach Strunz …   Deutsch Wikipedia

  • braunit — BRAUNÍT s.n. Oxid de mangan cu luciu semimetalic, constituind un important minereu de mangan. – Din fr. braunite. Trimis de valeriu, 21.03.2003. Sursa: DEX 98  braunít s. n. (sil. brau ) Trimis de siveco, 10.08.2004. Sursa: Dicţionar ortografic… …   Dicționar Român

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