mineral
Bornite
Bornite (Cu5FeS4)
Hardness: 3 (Mohs). Color: Copper-red to bronze on fresh surface, quickly tarnishing to iridescent purple, blue, and green. Luster: Metallic. Crystal Structure: Orthorhombic. Specific Gravity: 4.9-5.3.
- Hardness
- 3 (Mohs)
- Luster
- Metallic
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Physical properties
Hardness: 3 (Mohs). Color: Copper-red to bronze on fresh surface, quickly tarnishing to iridescent purple, blue, and green. Luster: Metallic. Crystal Structure: Orthorhombic. Specific Gravity: 4.9-5.3.
Formation & geological history
Formed in copper ore deposits, hydrothermal veins, and contact metamorphic zones. It can occur as a primary mineral or a secondary mineral in enrichment zones.
Uses & applications
Significant ore of copper; highly sought after by mineral collectors for its vibrant iridescent tarnish.
Geological facts
Nickname 'Peacock Ore' is commonly used due to its brilliant purple and blue tarnish. While naturally iridescent, many market specimens are acid-washed Chalcopyrite to enhance colors.
Field identification & locations
Identify by its 'shattered' iridescent surface and grayish-black streak. Commonly found in copper mines in Arizona (USA), Mexico, Peru, and Namibia.
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