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Bornite (Photo) [abbr. Bn ]

Year of discovery: 1725 (Jáchymov (St Joachimsthal), Czech), 1875 (Japan)

Locality list: 555 localities of bornite

• Cu₅FeS₄
• [Cu²⁺₅][Fe²⁺][S₄]

• Class: Sulfide
• Insoluble in: HCl
• Magnetism: Paramagnetic (After heating)

• Color: Copper red-Iron black
• Tarnish: Iridescent purple (Readily)
• Streak: Light gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Dodecahedral, Octahedral
• Twin: {111}, Intrusion twin is common

• Cleavage: Indistinct on {111} (2 planes)
• Hardness: 3
• Density: 5.1

• System: Orthorhombic, Pseudocubic
• Group: mmm, Pbca
• Lattice: a=11.0, b=21.9, c=11.0

Etymology: Ignatius von Born (1742-1791), Australian mineralogist