Columbite Group

The columbite group includes:

columbite-(Fe): Fe²⁺Nb₂O₆
columbite-(Mg): MgNb₂O₆
columbite-(Mn): Mn²⁺Nb₂O₆
tantalite-(Fe): Fe²⁺Ta₂O₆
tantalite-(Mg): MgTa₂O₆
tantalite-(Mn): Mn²⁺Ta₂O₆

The columbite group is a member of the columbite supergroup.

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