mineral
Peacock Ore
Bornite (Cu5FeS4)
AI-generated identification · may be incorrectHardness 3 on Mohs scale, metallic luster, brass-brown to dark gray color that tarnishes to iridescent purple and blue, specific gravity 4.9-5.3, crystal system is orthorhombic.
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Physical properties
Hardness 3 on Mohs scale, metallic luster, brass-brown to dark gray color that tarnishes to iridescent purple and blue, specific gravity 4.9-5.3, crystal system is orthorhombic.
Formation & geological history
Forms primarily in hydrothermal veins and contact metamorphic zones, often associated with other copper sulfides.
Uses & applications
A major economic ore of copper and popular mineral specimen for collectors.
Geological facts
Naturally tarnishes quickly in air to display its vibrant rainbow colors, giving it the common name peacock ore.
Field identification & locations
Identify by its distinct iridescent tarnish and lower hardness than chalcopyrite; found worldwide in major copper-producing regions.
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