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 tarnish. Crystal system is orthorhombic.
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Physical properties
Hardness of 3 on the Mohs scale, metallic luster, and a distinctive iridescent purple, blue, and brassy tarnish. Crystal system is orthorhombic.
Formation & geological history
Forms in hydrothermal veins and igneous or metamorphic contact zones through the combination of copper, iron, and sulfur.
Uses & applications
Primarily mined as a minor ore of copper and widely collected by mineral enthusiasts for its vibrant colors.
Geological facts
Natural freshly broken bornite is brownish-bronze and rapidly tarnishes into its famous rainbow colors when exposed to air.
Field identification & locations
Identified by its soft Mohs hardness, high specific gravity, and characteristic multicolored metallic tarnish.
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