mineral
Peacock Ore
Bornite (Cu5FeS4) with artificially induced tarnish
AI-generated identification · may be incorrectHardness is 3 on the Mohs scale. Displays a distinctive iridescent, metallic multicolored tarnish with a dark grayish-black streak.
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Physical properties
Hardness is 3 on the Mohs scale. Displays a distinctive iridescent, metallic multicolored tarnish with a dark grayish-black streak.
Formation & geological history
Forms in hydrothermal veins and igneous intrusions, often naturally dull bronze before chemical treatment to produce vibrant colors.
Uses & applications
Primarily used as an ornamental mineral specimen and in lapidary jewelry due to its striking iridescent appearance.
Geological facts
Natural bornite develops a purple-to-blue tarnish upon air exposure, but specimens with intense rainbow colors are typically treated with acid.
Field identification & locations
Easily identified by its colorful metallic sheen and association with copper ores; commonly sourced from Mexico and Peru.
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