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Tantalite-(Fe)

Year of discovery: 1944 (Upper Bear Gulch, USA), 1957 (Japan)

Locality list: A locality of tantalite-(Fe)

• FeTa₂O₆
• [Fe²⁺][(TaO₃)₂]^2-

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

• Polymorph: Tapiolite-(Fe) (Tetragonal)

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

• TaO₃ => NbO₃: Columbite-(Fe) (Series)

• Color: Black
• Streak: Black
• Luster: Sub-Metallic
• Diaphaneity: Opaque

• Habit: Long tabular

• Cleavage: Distinct on {100} and {010} (2 planes)
• Hardness: 6-6.5
• Density: 8.2

• System: Orthorhombic
• Group: mmm, Pbcn
• Lattice: a=5.7, b=14.2, c=5.1

Synonym: Ferrotantalite