mineral
Chalcopyrite on Quartz
Copper Iron Sulfide (CuFeS2)
AI-generated identification · may be incorrectHardness: 3.5 to 4 on Mohs scale. Color: Brass yellow, frequently with an iridescent purple, blue, or greenish tarnish (peacock ore). Luster: Metallic. Crystal Structure: Tetragonal. Cleavage: Indistinct. Specific Gravity: 4.1-4.3.
- Hardness
- 3
- Luster
- Metallic
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Physical properties
Hardness: 3.5 to 4 on Mohs scale. Color: Brass yellow, frequently with an iridescent purple, blue, or greenish tarnish (peacock ore). Luster: Metallic. Crystal Structure: Tetragonal. Cleavage: Indistinct. Specific Gravity: 4.1-4.3.
Formation & geological history
Hydrothermal mineral formed in veins and volcanic deposits associated with medium and high temperature environments. It commonly crystallizes alongside quartz, pyrite, and sphalerite in magmatic sulfide deposits.
Uses & applications
Primary ore of copper metal worldwide. Used extensively in metallurgy, electrical wiring, electronics, alloys like bronze and brass, as well as a popular mineral specimen for collectors.
Geological facts
Often called 'Fool's Gold' alongside pyrite because of its golden metallic luster, but chalcopyrite is softer than pyrite and can be scratched with a steel knife. It exhibits a beautiful rainbow iridescence when tarnished.
Field identification & locations
Identified by its brassy golden-yellow color with metallic luster, iridescent rainbow tarnish, relative softness (can be scratched by steel), and greenish-black streak. Commonly found in copper mines globally, including Peru, Arizona (USA), Canada, and Cornwall (UK).
