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

First Known Use of manganite

1827, in the meaning defined at sense 1

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The first known use of manganite was in 1827

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