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Samarskite-(Y)

Year of discovery: 1847 (Blyumovskaya pit, Ilmen Natural Reserve, Russia), 1922 (Japan)

Locality list: 67 localities of samarskite-(Y)

• Y₂Nb₂O₈
• (Y,Fe,U,Th,Ca)₂(Nb,Ta)₂O₈
• [Y³⁺₂][(NbO₄)₂]^6-

• Class: Samarskite group
• Class: Niobate
• Soluble in: HCl (Slightly)
• Radioactive: Very strong

• Polymorph: Fergusonite-(Y) (Tetragonal), β-Fergusonite-(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: Black, Yellowish brown
• Streak: Dark brown
• Luster: Vitreous
• Diaphaneity: Opaque

• Habit: Thin platy

• Cleavage: Imperfect on {010} (1 plane)
• Hardness: 5-6
• Density: 5.7

• System: Orthorhombic
• Group: mmm, Pbcn
• Lattice: a=5.7, b=4.9, c=5.2