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Stibiotantalite

Year of discovery: 1893 (Greenbushes, Australia), 1994 (Japan)

Locality list: 2 localities of stibiotantalite

• SbTaO₄
• Sb(Ta,Nb)O₄
• [Sb³⁺][TaO₄]^3-

• Class: Stibiocolumbite group
• Class: Tantalate
• Insoluble in: HCl

• Sb => Bi: Bismutotantalite
• Sb => Y: Yttrotantalite-(Y), Formanite-(Y), Iwashiroite-(Y), Takanawaite-(Y)

• TaO₄ => NbO₄: Stibiocolumbite (Series)
• TaO₄ => SbO₄: Cervantite, Clinocervantite

• Sb₂ => MnSn; Wodginite
• Sb₂ => FeSn; Ferrowodginite
• Sb₂ => MnTi; Titanowodginite

• Color: Yellow, Dark brown
• Streak: Pale yellowish brown
• Luster: Adamantine
• Diaphaneity: Translucent

• Cleavage: Distinct on {001} (1 plane), Indistinct on {100} (1 plane)
• Hardness: 5.5
• Density: 6.7

• System: Orthorhombic
• Group: mm2, Pc2₁n
• Lattice: a=4.9, b=11.8, c=5.5