mineral

Peacock Ore (Bornite/Chalcopyrite)

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2)

Hardness: 3-3.5 (Bornite); Color: Copper-red to brown, tarnishing to iridescent blue/purple/green; Luster: Metallic; Crystal: Orthorhombic/Tetragonal; Gravity: 5.06-5.08

Hardness: 3-3
Luster: Metallic

Identified April 6, 2026More mineral →

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Physical properties

Hardness: 3-3.5 (Bornite); Color: Copper-red to brown, tarnishing to iridescent blue/purple/green; Luster: Metallic; Crystal: Orthorhombic/Tetragonal; Gravity: 5.06-5.08

Formation & geological history

Formed in hydrothermal veins, contact metamorphic zones, and igneous intrusions. The iridescence is a result of surface oxidation of the copper-iron sulfide minerals.

Uses & applications

An important ore of copper. In smaller specimens, it is highly valued by collectors and used as decorative display pieces or in metaphysical circles.

Geological facts

Often called 'Peacock Ore' because its iridescent tarnish resembles peacock feathers. While Bornite is naturally irisdescent, much of the Peacock Ore sold in shops is actually Chalcopyrite treated with acid to produce the colors.

Field identification & locations

Identified by its heavy weight (high specific gravity) and brilliant metallic colors. Commonly found in copper mines worldwide, notably in the USA, Mexico, and Chile.

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