Mineral

Peacock Ore (Chalcopyrite/Bornite)

Bornite (Cu5FeS4) or iridescent treated Chalcopyrite (CuFeS2)

Hardness: 3 - 4 (Mohs scale); Color: Metallic brassy yellow that tarnishes to iridescent shades of blue, purple, and gold; Luster: Metallic; Crystal Structure: Tetragonal or Orthorhombic; Specific Gravity: 4.1 - 4.3.

Hardness: 3 - 4 (Mohs scale)
Luster: Metallic

Identified February 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins, contact metamorphic zones, and as a primary mineral in igneous rocks. While bornite is naturally iridescent, most 'Peacock Ore' sold in shops is chalcopyrite that has been acid-washed to enhance the colorful tarnish.

Uses & applications

Major ore of copper; highly popular as a decorative specimen for mineral collectors and used in metaphysical practices.

Geological facts

Natural Bornite is often called 'the peacock mineral' because its tarnish resembles a peacock's feathers. It is one of the most colorful minerals in the world and has been mined since ancient times for its high copper content (about 63%).

Field identification & locations

Identify in the field by its metallic luster and brilliant multi-colored iridescent tarnish. It is much softer than similar-looking minerals like pyrite. Commonly found in major copper mining districts like Arizona (USA), Mexico, and Chile.

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