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Columbite series

[ A²⁺ ][(NbO₃)₂]

• [ Fe ]: Columbite-(Fe)
• [ Mn ]: Columbite-(Mn)
• [ Mg ]: Columbite-(Mg)

• Class: Tantalite group
• NbO₃ => TaO₃: Tantalite series, Tapiolite series

• Class: Niobate