mineral

Peacock Ore

Bornite (Cu5FeS4) or Acid-Treated Chalcopyrite (CuFeS2)

Hardness: 3-3.5 (Mohs scale), Color: Iridescent blue, purple, magenta, gold, and green, Luster: Metallic, Crystal structure: Orthorhombic (Bornite) or Tetragonal (Chalcopyrite), Specific gravity: 5.06-5.08

Hardness: 3-3

Identified July 13, 2026More mineral →

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Physical properties

Formation & geological history

Peacock ore is usually formed in hydrothermal veins, contact metamorphic zones, or as a secondary mineral in the oxidation zones of copper deposits. Most iridescent specimens sold today are chalcopyrite that has been briefly dipped in acid to accelerate the oxidation process.

Uses & applications

Primarily a minor ore of copper; widely sold as a decorative mineral specimen for collectors and in metaphysical shops.

Geological facts

It is nicknamed Peacock Ore due to its bright, multi-colored tarnish that resembles peacock feathers. Natural bornite tarnishes to these colors over time, but the extremely vibrant purple/blue pieces are almost always acid-enhanced chalcopyrite.

Field identification & locations

Identify by its heavy weight for its size and its distinctive rainbow-like metallic tarnish. Unlike Labradorite, the color is on the surface rather than inside the stone. Found commonly in copper-rich regions like Arizona (USA), Mexico, and Chile.

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sedimentary

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Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

sedimentary

Schist

Metamorphic

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Mineral

Epidote

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Mineral/Rock