mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
AI-generated identification · may be incorrectHardness: 3 (Mohs scale), Color: Brownish-bronze (fresh surface) to iridescent blue, purple, and green (tarnished surface), Luster: Metallic, Crystal Structure: Orthorhombic/Isometric, Cleavage: Poor, Specific Gravity: 5.06-5.08
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Physical properties
Hardness: 3 (Mohs scale), Color: Brownish-bronze (fresh surface) to iridescent blue, purple, and green (tarnished surface), Luster: Metallic, Crystal Structure: Orthorhombic/Isometric, Cleavage: Poor, Specific Gravity: 5.06-5.08
Formation & geological history
Occurs in hydrothermal veins, contact metamorphic zones, and as a secondary mineral in enriched copper deposits. It is often found in both igneous and metamorphic copper-rich environments.
Uses & applications
A major ore of copper used in industrial electrical wiring and electronics. Also popular among collectors and used in jewelry as 'Peacock Ore'.
Geological facts
Nicknamed 'Peacock Ore' because of its rapid tarnish into vibrant iridescent colors. While natural bornite is iridescent, many commercial 'peacock ore' specimens are actually acid-treated chalcopyrite.
Field identification & locations
Identify in the field by its distinct metallic iridescence and relatively low hardness compared to other metallic minerals. Commonly found in copper mining districts like those in Chile, Arizona, and Cornwall.
