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manganite in British English
(ˈmæŋɡəˌnaɪt)
noun
a blackish mineral consisting of basic manganese oxide in monoclinic crystalline form: a source of manganese. Formula: MnO(OH)
manganite in American English
(ˈmæŋgəˌnaɪt)
noun
1.
a dark-colored, shiny mineral, MnO(HO), that is an ore of manganese; hydrous manganese oxide
2.
any of a series of salts that may be considered as derivatives of manganous acid, the hydroxide of tetravalent manganese
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