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Fergusonite group

[ A3+ ][ X O₄]

• [ Ce ][ Nb ]; Fergusonite-(Ce)
• [ Nd ][ Nb ]; Fergusonite-(Nd)
• [ Y ][ Nb ]; Fergusonite-(Y)
• [ Y ][ Ta ]; Formanite-(Y)

• Polymorph: β-Fergusonite group (Monoclinic), Samarskite group (Monoclinic)
• NbO₄ => TaO₄: Yttrotantalite group

• Class: Niobate, Tantalate
• System: Tetragonal