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β-Fergusonite group, Fergusonite-β group

[ A³⁺ ][NbO₄]

• [ Ce ]: β-Fergusonite-(Ce)
• [ Nd ]: β-Fergusonite-(Nd)
• [ Y ]: β-Fergusonite-(Y)

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

• Class: Niobate
• System: Monoclinic