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 has an isometric crystal system and poor cleavage.
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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 has an isometric crystal system and poor cleavage.
Formation & geological history
Forms in hydrothermal veins and copper-bearing ore deposits through the combination of copper, iron, and sulfur under high temperatures.
Uses & applications
Primarily mined as a minor ore of copper and widely collected and sold as polished mineral specimens due to its vibrant colors.
Geological facts
Natural freshly broken bornite is brownish-bronze and only develops its famous rainbow tarnish upon exposure to air and light, though many commercial specimens are treated with acid to enhance the colors.
Field identification & locations
Easily identified by its colorful peacock-like tarnish, high copper weight, and association with other copper minerals like chalcopyrite. Found globally in major mining regions.
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