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β-Fergusonite-(Y)

Year of discovery: 1961 (Asht-Sai, Tajikistan), 1963 (Japan)

Locality list: 4 localities of β-fergusonite-(Y)

• YNbO₄
• (Y,Ce,Nd)NbO₄
• [Y³⁺][NbO₄]^3-

• Class: β-Fergusonite group
• Class: Niobate

• Polymorph: Fergusonite-(Y) (Tetragonal), Samarskite-(Y) (Monoclinic)

• Y => Ce: Fergusonite-(Ce), β-Fergusonite-(Ce)
• Y => Nd: β-Fergusonite-(Nd)
• Y => Yb: Samarskite-(Yb)
• Y => Ca: Calciosamarskite

• Y₂ => UFe: Ishikawaite, Petscheckite
• Y₂ => YU: Yttrocolumbite-(Y)
• Y₂ => U: Liandratite

• NbO₄ => VO₄: Wakefieldite-(Y)
• NbO₄ => TaO₄: Yttrotantalite-(Y), Formanite-(Y), Iwashiroite-(Y), Takanawaite-(Y)

• Color: Yellow
• Luster: Vitreous
• Diaphaneity: Translucent-Opaque

• Hardness: 5.5-6.5

• System: Monoclinic
• Group: 2, I2
• Lattice: a=5.3, b=10.9, c=5.1, β=94.6

Synonym: Fergusonite-β-(Y)