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braunite

   Also found in: Dictionary/thesaurus, Wikipedia 0.05 sec.
braunite [′brau̇‚nīt]
(mineralogy)
3Mn2O3·MnSiO3Brittle mineral that forms tetragonal crystals; commonly found as steel-gray or brown-black masses in the United States, Europe, and South America; it is an ore of manganese.


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