mineral

Peacock Ore (Bornite or Iridescent Chalcopyrite)

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

AI-generated identification · may be incorrect

Hardness: 3 on Mohs scale; Color: Iridescent blues, purples, golds, and greens; Luster: Metallic; Crystal Structure: Orthorhombic/Tetragonal; Streak: Grayish-black.

Hardness: 3 on Mohs scale
Color: Iridescent blues, purples, golds, and greens
Luster: Metallic

Identified July 20, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Iridescent blues, purples, golds, and greens; Luster: Metallic; Crystal Structure: Orthorhombic/Tetragonal; Streak: Grayish-black.

Formation & geological history

Formed in hydrothermal veins, contact metamorphic zones, and as a primary mineral in basic igneous rocks. The intense colors are often enhanced or created by treating the mineral with acid to induce oxidation.

Uses & applications

Major ore of copper; used as a decorative specimen for collectors and in metaphysical jewelry.

Geological facts

While bornite naturally tarnishes to these colors (earning it the name peacock ore), most bright specimens sold in shops are actually chalcopyrite that has been intentionally treated with acid to produce the vibrant iridescent coating.

Field identification & locations

Identified by its intense metallic iridescence and relatively low hardness (can be scratched by a copper coin). Found globally in copper deposits like those in Montana, Arizona, and Cornwall.