Lot # 69 - Peacock Ore ( Bornite)

Opening Bid : $ 5.00
Pickup Instructions:
Start Date/Time: 02-Mar-2026 7:00:00 AM
End Date/Time: 09-Mar-2026 8:10:00 PM
Current bid:

$8.00

Highest bidder:

Wisewillow

Auction has ended

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 gemstone and mineral descriptions are provided to the best of our ability based on visual assessment and available information. None of the stones in this auction have been GIA‑certified or professionally graded. The winning bidder is welcome to have any stone independently certified, graded, or appraised at their own expense. All items are sold as‑is.

Dimensions : 3 in W x 3.5 in H

Auction History

Highest bidder is Wisewillow

Date Bid User
09-Mar-2026 8:06:11 PM $8.00 Wisewillow
09-Mar-2026 8:06:11 PM $7.00 GSSpence
09-Mar-2026 11:54:27 AM $5.00 Wisewillow

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