mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
Hardness: 3.5-4 on the Mohs scale, Color: Brass-yellow often with a colorful iridescent tarnish (peacock ore), Luster: Metallic, Crystal Structure: Tetragonal, Cleavage: Indistinct, Specific Gravity: 4.1-4.3
- Hardness
- 3
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Physical properties
Hardness: 3.5-4 on the Mohs scale, Color: Brass-yellow often with a colorful iridescent tarnish (peacock ore), Luster: Metallic, Crystal Structure: Tetragonal, Cleavage: Indistinct, Specific Gravity: 4.1-4.3
Formation & geological history
Forms in hydrothermal veins, pegmatites, and sedimentary deposits, often associated with other copper and sulfide minerals.
Uses & applications
Primary ore of copper; also collected as a mineral specimen.
Geological facts
Chalcopyrite is frequently confused with pyrite and gold, earning it the nickname 'fool's gold.' Unlike gold, it is brittle and softer, and unlike pyrite, it has a deeper yellow color with a greenish-black streak.
Field identification & locations
Found worldwide in copper-bearing ore bodies. Identified by its brassy yellow color, metallic luster, and softness.
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