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Samarskite group
[ A
3+
2
][(NbO
4
)
2
]
[ Y ]:
Samarskite-(Y)
[ Yb ]: Samarskite-(Yb)
Polymorph:
Fergusonite group
(Tetragonal),
β-Fergusonite group
(Monoclinic)
NbO
4
=> TaO
4
:
Yttrotantalite group
Class:
Niobate
System: Monoclinic