Braunite
an ore of manganese, 3Mn 2 O 3 ⋅MnSiO 3 .
Historical Examples
Scientific American Supplement, No. 401, September 8, 1883 Various
A Dictionary of Arts, Manufactures and Mines Andrew Ure
noun
a brown or black mineral that consists of manganese oxide and silicate and is a source of manganese. Formula: 3Mn2O3.MnSiO3
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