mineral
Peacock Ore
Bornite (Cu5FeS4)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, metallic luster, and a distinctive iridescent purple, blue, and brassy-yellow tarnish. It crystallizes in the orthorhombic system and has a dark grayish-black streak.
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Physical properties
Hardness of 3 on the Mohs scale, metallic luster, and a distinctive iridescent purple, blue, and brassy-yellow tarnish. It crystallizes in the orthorhombic system and has a dark grayish-black streak.
Formation & geological history
Forms primarily in hydrothermal veins and contact metamorphic zones, often associated with other copper sulfides like chalcopyrite. It is found worldwide in copper-rich ore deposits.
Uses & applications
Extensively mined as a high-grade copper ore and prized by mineral collectors for its vibrant rainbow iridescence.
Geological facts
Natural freshly broken bornite is brownish-bronze; the brilliant peacock colors develop rapidly upon exposure to air due to surface oxidation.
Field identification & locations
Easily identified by its colorful tarnished surface and soft copper sulfide nature. Common locations include US, Mexico, Peru, and Chile.
