manganite

noun

man·ga·nite | \ˈmaŋ-gə-ˌnīt

\

Definition of manganite

1 : a metallic gray to black mineral MnO(OH) that is a hydroxide and minor ore of manganese

2 : any of various unstable salts made by reaction of manganese dioxide with a base

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manganic hydroxide

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The first known use of manganite was in 1827

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