mineral
Peacock Ore
Bornite (Cu5FeS4)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale with a metallic luster. Displays a characteristic iridescent purple, blue, and brassy-yellow tarnish.
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Physical properties
Hardness of 3 on the Mohs scale with a metallic luster. Displays a characteristic iridescent purple, blue, and brassy-yellow tarnish.
Formation & geological history
Forms in hydrothermal veins and igneous or metamorphic rocks through copper-iron sulfide deposition.
Uses & applications
Primarily mined as a minor ore of copper and widely collected as a decorative mineral specimen.
Geological facts
Natural bornite is a dull brownish-bronze; the vibrant rainbow colors develop rapidly upon exposure to air or through artificial acid treatment.
Field identification & locations
Easily identified by its colorful tarnish and softness compared to similar-looking pyrite. Commonly sourced from Mexico, Peru, and the USA.
