manganite

[mang-guh-nahyt]
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noun

a gray to black mineral, hydrous manganese oxide, MnO(OH); gray manganese ore.
Chemistry. any of a series of salts containing tetravalent manganese and derived from either of two acids, H4MnO4 or H2MnO3.

Origin of manganite

First recorded in 1820–30; mangan(ese) + -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for manganite

manganite

noun

a blackish mineral consisting of basic manganese oxide in monoclinic crystalline form: a source of manganese. Formula: MnO(OH)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012