mineral
Bornite
Bornite (Cu5FeS4)
Hardness: 3 (Mohs scale); Color: Brownndish-bronze, tarnishing to iridescent purple/blue (Peacock Ore); Luster: Metallic; Crystal Structure: Orthorhombic (pseudocubic); Cleavage: Poor; Specific Gravity: 5.06-5.08
- Hardness
- 3 (Mohs scale)
- Luster
- Metallic
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Physical properties
Hardness: 3 (Mohs scale); Color: Brownndish-bronze, tarnishing to iridescent purple/blue (Peacock Ore); Luster: Metallic; Crystal Structure: Orthorhombic (pseudocubic); Cleavage: Poor; Specific Gravity: 5.06-5.08
Formation & geological history
Formed in hydrothermal veins, contact metamorphic zones, and as a secondary mineral in enriched zones of copper deposits. Often associated with chalcopyrite and chalcocite.
Uses & applications
Major ore of copper; used for copper extraction in industry and as a popular decorative and collecting mineral.
Geological facts
Nickname 'Peacock Ore' comes from its spectacular iridescent tarnish. It contains approximately 63% copper by mass.
Field identification & locations
Identified by its distinctive iridescent 'oil slick' tarnish and metallic sheen. Found in copper mines in locations like Arizona (USA), Cornwall (UK), and Chile.
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Mineral/Rock
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