mineral
Peacock Ore (Bournite/Chalcopyrite)
Bornite (Cu5FeS4) or Acid-Treated Chalcopyrite (CuFeS2)
Hardness: 3 (Bornite) to 3.5-4 (Chalcopyrite); Color: Iridescent blues, purples, golds, and greens over a dark metallic base; Luster: Metallic; Crystal Structure: Orthorhombic or Tetragonal; Cleavage: Poor; Specific Gravity: 4.1-5.3
- Hardness
- 3 (Bornite) to 3
- Luster
- Metallic
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Physical properties
Hardness: 3 (Bornite) to 3.5-4 (Chalcopyrite); Color: Iridescent blues, purples, golds, and greens over a dark metallic base; Luster: Metallic; Crystal Structure: Orthorhombic or Tetragonal; Cleavage: Poor; Specific Gravity: 4.1-5.3
Formation & geological history
Found in hydrothermal veins, contact metamorphic zones, and magmatic segregations. The intense colors are often enhanced or created artificially by washing the specimen in acid (such as vinegar or lemon juice) to speed up oxidation.
Uses & applications
Major ore of copper. Specimens are popular in jewelry, as decorative display pieces, and in crystal healing collections.
Geological facts
True Bornite tarnishes naturally, but most bright iridescent specimens sold as 'Peacock Ore' in shops are actually Chalcopyrite that has been chemically treated to produce the vibrant rainbow colors.
Field identification & locations
Identify by its metallic luster and vivid multi-colored tarnish. It is much softer than gold (with which pyrites are often confused) and leaves a grayish-black streak if scratched.
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