Braunite

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 (1790–187...
Found on http://en.wikipedia.org/wiki/Braunite

Braunite

• (n.) A native oxide of manganese, of dark brownish black color. It was named from a Mr. Braun of Gotha.
Found on http://thinkexist.com/dictionary/meaning/braunite/

Braunite

Braun'ite noun (Min.) A native oxide of manganese, of dark brownish black color. It was named from a Mr. Braun of Gotha.
Found on http://www.encyclo.co.uk/webster/B/93

Braunite

Braunite, named after Braun, is a native oxide of manganese, of dark brownish black colour.
Found on http://www.probertencyclopaedia.com/browse/HB.HTM
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