mineral
Copper-Bearing Sulfide Ore (likely Chalcopyrite or Bornite)
Chalcopyrite (CuFeS2) or Bornite (Cu5FeS4) in host rock
Hardness: 3.5-4 (Mohs); Color: Brassy yellow or iridescent purple/blue when weathered; Luster: Metallic; Cleavage: Poor; Streak: Greenish-black
- Hardness
- 3
- Color
- Brassy yellow or iridescent purple/blue when weathered
- Luster
- Metallic
Identified More mineral →
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Physical properties
Hardness: 3.5-4 (Mohs); Color: Brassy yellow or iridescent purple/blue when weathered; Luster: Metallic; Cleavage: Poor; Streak: Greenish-black
Formation & geological history
Formation occurs in hydrothermal veins, contact metamorphic deposits, and porphyry copper deposits. This specimen likely comes from a volcanic-associated environment common in the Andes.
Uses & applications
Primary ore of copper; used for electrical wiring, plumbing, and making brass/bronze alloys. High-grade specimens are valued by collectors.
Geological facts
The regional coordinates provided (17.2 S, 71 W) are in southern Peru, a globally significant copper mining region (near the Moquegua and Tacna departments). This area is home to world-class porphyry copper deposits like Cuajone and Toquepala.
Field identification & locations
Identified by its metallic luster and brassy to iridescent tarnish. In the field, look for 'peacock' colors and association with green/blue oxidation products like malachite.
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