braunite definition

  • noun:
    • A silicate mineral containing divalent and trivalent manganese and forming grey-black tetragonal crystals.
    • A native oxide of manganese, of dark brownish black shade. It was called from a Mr. Braun of Gotha.
    • A native oxid of manganese, containing additionally 20 per cent. of manganese silicate.
    • It occurs in tetragonal crystals of a brownish-black color in Thuringia, the Harz, Piedmont, and somewhere else.

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