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Columbite-(Mn)

Mineral Data
(Mn,Fe)(Nb,Ta)2O6
Strunz: 
4.DB.35
Physical Properties
Hardness: 
6.0
Synonyms
Synonyms: 
Columbite-Mn, Columbite Mn, Columbite - Mn, Manganocolumbite and Mangano Columbite