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Yttrotantalite-(Y)

Year of discovery: 1802 (Ytterby, Sweden), 1944 (Japan)

Locality list: 4 localities of yttrotantalite-(Y)

• YTaO₄
• (Y,Ca,U⁴⁺,Fe²⁺)(Ta,Nb)O₄
• [Y³⁺₂][(TaO₄)₂]^6-

• Class: Yttrotantalite group
• Class: Tantalate
• Insoluble in: HCl
• Radioactive: Strong

• Polymorph: Formanite-(Y) (Tetragonal), Iwashiroite-(Y) (Monoclinic), Takanawaite-(Y) (Monoclinic)

• Y => Bi: Bismutotantalite
• Y => Sb: Stibiotantalite

• Y₂ => MnSn; Wodginite
• Y₂ => FeSn; Ferrowodginite
• Y₂ => MnTi; Titanowodginite

• TaO₄ => VO₄: Wakefieldite-(Y)
• TaO₄ => NbO₄: Fergusonite-(Y), β-Fergusonite-(Y), Samarskite-(Y)

• Color: Brown, Black
• Streak: Gray
• Luster: Vitreous
• Diaphaneity: Opaque

• Cleavage: Indistinct on {010} (1 plane)
• Hardness: 5-5.5
• Density: 5.7

• System: Monoclinic
• Group: 2/m, I2/a
• Lattice: a=5.3, b=10.9, c=5.1, β=95.3