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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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Time Traveler for manganite
The first known use of manganite was in 1827
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