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Columbite-(Fe) (Photo)

Year of discovery: 1801 (Green's Well pegmatite, Australia), 1899 (Japan)

Locality list: 102 localities of columbite-(Fe)

• FeNb₂O₆
• [Fe²⁺][(NbO₃)₂]^2-

• Class: Columbite series - Tantalite group
• Class: Niobate
• Soluble in: HCl (Decompose)
• Magnetism: Paramagnetic

• Fe => Mn: Columbite-(Mn) (Series)
• Fe => Mg: Columbite-(Mg)

• NbO₃ => TaO₃: Tantalite-(Fe) (Series), Tapiolite-(Fe)

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

• Habit: Long tabular

• Cleavage: Distinct on {100} and {010} (2 planes)
• Hardness: 6
• Density: 6.3

• System: Orthorhombic
• Group: mmm, Pbcn
• Lattice: a=14.3, b=5.7, c=5.1

Etymology: Columbia, synonym of USA

Synonym: Ferrocolumbite