mineral
Peacock Ore
Bornite (Cu5FeS4)
Hardness: 3-3.25 on the Mohs scale, Color: Bronze to copper-red on fresh surfaces, tarnishing to iridescent purple, blue, and green, Luster: Metallic, Crystal Structure: Orthorhombic, Cleavage: Poor, Specific Gravity: 4.9-5.3
- Hardness
- 3-3
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Physical properties
Hardness: 3-3.25 on the Mohs scale, Color: Bronze to copper-red on fresh surfaces, tarnishing to iridescent purple, blue, and green, Luster: Metallic, Crystal Structure: Orthorhombic, Cleavage: Poor, Specific Gravity: 4.9-5.3
Formation & geological history
Formed in hydrothermal veins and igneous or metamorphic rocks through the deposition of copper and iron sulfides.
Uses & applications
Used primarily as a copper ore, in mineral collections, and for ornamental or metaphysical purposes.
Geological facts
Natural bornite develops a characteristic iridescent tarnish when exposed to air, which is why it is commonly referred to as peacock ore, though much of the vibrant peacock ore sold commercially is actually chalcopyrite treated with acid.
Field identification & locations
Easily identified by its distinctive colorful tarnish and metallic luster. Commonly found in copper-rich mining regions worldwide.
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