mineral

Peacock Ore

Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)

AI-generated identification · may be incorrect

Hardness: 3-3.5 on Mohs scale; Color: Copper-red/brown on fresh surface, tarnishing to iridescent purple, blue, and gold; Luster: Metallic; Crystal Structure: Orthorhombic/Tetragonal; Cleavage: Poor/Invisible.

Hardness: 3-3
Luster: Metallic

Identified June 10, 2026More mineral →

Explore Peacock Ore in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed in hydrothermal veins, contact metamorphic zones, and igneous intrusions. It is typically a primary copper mineral associated with other sulfides like pyrite and chalcocite.

Uses & applications

Primarily used as a major copper ore in the mining industry. Because of its brilliant iridescence, it is highly popular for decorative jewelry, metaphysical collections, and educational specimens.

Geological facts

The name 'Peacock Ore' is commonly used for both Bornite and acid-treated Chalcopyrite. While Bornite tarnishes naturally, many specimens sold in shops are Chalcopyrite that has been washed in acid to induce the rainbow colors.

Field identification & locations

Identify in the field by its metallic luster and the 'oil slick' rainbow tarnish. Unlike true gold, it has a greenish-black streak and is much more brittle. Common locations include Mexico, USA, and Chile.