Peacock Ore

Physical Properties

Hardness: 3-3.5 on Mohs scale. Color: Initially bronze-brown, tarnishing to iridescent blues, purples, and greens. Luster: Metallic. Crystal Structure: Orthorhombic. Cleavage: Poor.

Formation & Geological History

Formed in copper ore deposits, typically in hydrothermal veins, contact metamorphic zones, or as a secondary mineral in enriched zones of copper deposits.

Uses & Applications

Major ore of copper. Widely sold as ornamental specimens for collectors and in 'metaphysical' shops due to its vibrant colors.

Geological Facts

Natural Bornite develops its peacock-like tarnish organically upon exposure to air, but many specimens in the market are actually Chalcopyrite that has been acid-washed to force the iridescent oxidation.

Field Identification & Locations

Identify in the field by its distinctive iridescent tarnish and metallic gray-black streak on a porcelain plate. Commonly found in copper mines globally, notably in Arizona, Montana, and Mexico.

Identified on: 5/19/2026

Mode: Standard