mineral
Bornite
Bornite (Cu5FeS4)
AI-generated identification · may be incorrectHardness: 3 on Mohs scale; Color: Copper-red to brown on fresh surfaces, tarnishing to iridescent blues and purples; Luster: Metallic; Crystal Structure: Orthorhombic; Cleavage: Poor; Specific Gravity: 5.06-5.08
- Hardness
- 3 on Mohs scale
- Luster
- Metallic
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Physical properties
Hardness: 3 on Mohs scale; Color: Copper-red to brown on fresh surfaces, tarnishing to iridescent blues and purples; Luster: Metallic; Crystal Structure: Orthorhombic; Cleavage: Poor; Specific Gravity: 5.06-5.08
Formation & geological history
Formed in copper ore deposits, typically in hydrothermal veins, contact metamorphic zones, and as a secondary mineral in enriched zones of copper deposits.
Uses & applications
An important ore of copper (containing about 63% copper by mass); also popular as a display mineral for collectors due to its colors.
Geological facts
Commonly known as "Peacock Ore" because of its tarnish, which resembles the iridescent feathers of a peacock. While often confused with treated chalcopyrite, natural bornite produces a deep blue/purple tarnish.
Field identification & locations
Identify by its rapid tarnish from bronze to vibrant blue/purple. Found in copper mines worldwide, notably in Arizona-USA, Mexico, and Kazakhstan. Collectors should look for its metallic sheen and characteristic iridescence.
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