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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク braunite ： ウィキペディア英語版 braunite Braunite is a silicate mineral containing both di- and tri-valent manganese with the chemical formula: Mn2+Mn3+6().〔(Mindat )〕 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.〔(JoHan P. R. De Viliers, ''The crystal structure of braunite II and its relation to bixbyite and braunite,'' American Mineralogist, Volume 65, pages 756-765, 1980 )〕〔(Mindat, Braunite-II )〕 ==References== *(Webmineral ) *(Athena mineral ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「braunite」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.