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About: Braunite     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Substance100019613, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: Thingdul:ChemicalObjectchemical substanceMineralmineralyago:WikicatManganeseMineralsyago:WikicatMineralsyago:WikicatTetragonalMineralsyago:WikicatOxideMineralsyago:WikicatSilicateMineralsyago:WikicatSilicatesyago:Abstraction100002137yago:Chemical114806838yago:Compound114818238yago:Material114580897yago:Matter100020827yago:Mineral114662574yago:Part113809207yago:PhysicalEntity100001930yago:Relation100031921yago:Salt115010703yago:Silicate115040033yago:Substance100019613 New Facet based on Instances of this Class

Braunite is a silicate mineral containing both di- and tri-valent manganese with the chemical formula:Mn2+Mn3+6[O8|SiO4]. 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 the Wilhelm von Braun (1790–1872) 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.