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Tantalite-(Mn) (Photo)

Year of discovery: 1887 (Utö mines, Sweden), 1964 (Japan)

Locality list: 3 localities of tantalite-(Mn)

• MnTa₂O₆
• [Mn²⁺][(TaO₃)₂]^2-

• Class: Tantalite series < Tantalite group
• Class: Tantalate
• Soluble in: HCl (Slightly)

• Polymorph: Tapiolite-(Mn) (Tetragonal)

• Mn => Fe: Tantalite-(Fe) (Series), Tapiolite-(Fe)
• Mn => Mg: Tantalite-(Mg)

• TaO₃ => NbO₃: Columbite-(Mn)

• Color: Pale pink, Reddish brown, Black
• Streak: Brown, Black
• Luster: Vitreous
• Diaphaneity: Opaque

• Habit: Long tabular

• Cleavage: Distinct on {100} and {010} (2 planes)
• Hardness: 6
• Density: 8.1

• System: Orthorhombic
• Group: mmm, Pbcn
• Lattice: a=14.4, b=5.8, c=5.1

Synonym: Manganotantalite