Bournonite
A variety of Bournonite Group
What is Bournonite?
The appearance of bournonite gives clues as to the composition of this iridescent mineral. During the formation process, copper and lead mesh together into unique, cog-shaped crystals. Perfect specimens of this unusual crystalline form fetch very high prices in the collectors market!
Uses & Applications
Bournonite is a minor ore of copper and lead. Copper is used in wiring, electrical equipment, construction, and coins. Lead is used for car batteries, ammunition, weights, and radiation protection. Bournonite is also a valuable mineral among collectors for its rarity and cogwheel shape.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Bournonite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Bournonite Localities Map
See where Bournonite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Steel-gray
- Hardness (Mohs)
- 2.5 - 3
- Density
- 5.84 g/cm³
- Streak
- Steel-gray
- Luster
- Metallic
- Crystal System
- Orthorhombic
Chemical Properties
- Chemical Formula
- PbCuSbS3
- Elements
- Cu, Pb, S, Sb
Also Known As
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Bournonite FAQs
How do I identify Bournonite?
Bournonite can be identified by its hardness of 2.5 - 3 on the Mohs scale, Steel-gray color, Metallic luster, Orthorhombic crystal system. Look for these key characteristics when examining specimens.
What color is Bournonite?
Bournonite typically appears in Steel-gray. Color can vary depending on impurities and formation conditions.
How hard is Bournonite?
Bournonite has a hardness of 2.5 - 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.