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Tantalite series
[ A
2+
][(TaO
3
)
2
]
[ Fe ]:
Tantalite-(Fe)
[ Mn ]:
Tantalite-(Mn)
[ Mg ]: Tantalite-(Mg)
Class:
Tantalite group
Polymorph: Tapiolite series (Tetragonal)
TaO
3
=> NbO
O
:
Columbite series
Class:
Tantalate