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Yttrotantalite group
[ A
6+
][( X O
4
)
2
]
[ Y
2
][ Ta ]:
Yttrotantalite-(Y)
[ Y
2
][ Ta ]:
Iwashiroite-(Y)
[ Y(U
4+
,Fe
2+
) ][ Nb ]: Yttrocolumbite-(Y)
TaO
4
=> NbO
4
:
Samarskite group
(Monoclinic),
Fergusonite group
(Tetragonal),
β-Fergusonite group
(Monoclinic)
Class:
Tantalate
System: Orthorhombic