Lot # 69 - Peacock Ore ( Bornite)

Opening Bid : $ 5.00
Pickup Instructions: jan 25 10am
Start Date/Time: 02-Mar-2026 7:00:00 AM
End Date/Time: 09-Mar-2026 8:08:00 PM
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Description :

What Bornite Is

Bornite is a copper iron sulfide mineral and an important copper ore. Freshly broken material is usually a dark, bronzy brown, but it quickly tarnishes into those brilliant metallic colors.

Why It Looks So Colorful

The rainbow effect comes from thin‑film oxidation on the surface. As the mineral reacts with oxygen, microscopic layers form that reflect light in different wavelengths, producing:

  • Purples

  • Blues

  • Golds

  • Sometimes greens and pinks

This tarnish is natural and part of its charm.

Key Traits

  • Metallic luster

  • Iridescent tarnish (its signature look)

  • Relatively soft for a metallic mineral (Mohs ~3)

  • Often massive or chunky rather than well‑formed crystals

Where It’s Found

Bornite occurs in many copper‑rich deposits around the world, including:

  • Arizona and Montana (USA)

  • Mexico

  • Peru

  • Namibia

  • Australia

Why People Collect It

  • The colors are eye‑catching and unique

  • It’s a great teaching specimen for sulfide minerals

  • It’s historically important as a copper ore

  • Each piece develops its own pattern of iridescence over time

Disclaimer: All identifications are based solely on visual examination of the photographs provided. I do my best to describe each specimen accurately, but I am not a certified geologist, and some assessments may be incorrect. Buyers should review the images carefully and verify details independently.

Dimensions : 3 in W x 3.5 in H

Auction History

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