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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.

CharacteristicsEdit

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

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