mineral
Chalcopyrite
CuFeS2
Hardness: 3.5-4 on Mohs scale; Color: Brass-yellow, often with an iridescent tarnish showing blues, purples, and greens; Luster: Metallic; Crystal Structure: Tetragonal; Cleavage: Indistinct; Specific Gravity: 4.1-4.3
- Hardness
- 3
- Luster
- Metallic
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Physical properties
Hardness: 3.5-4 on Mohs scale; Color: Brass-yellow, often with an iridescent tarnish showing blues, purples, and greens; Luster: Metallic; Crystal Structure: Tetragonal; Cleavage: Indistinct; Specific Gravity: 4.1-4.3
Formation & geological history
Formed mainly in hydrothermal veins, associated with sulfide ore deposits, and in sedimentary rocks as replacements of organic matter; can form across various geological time periods.
Uses & applications
Primary ore of copper, occasionally cut into gemstones or collected as iridescent mineral specimens.
Geological facts
Often referred to as 'peacock ore' due to its vibrant tarnish, though true peacock ore is bornite. Natural chalcopyrite develops this iridescent patina upon exposure to air.
Field identification & locations
Identified by its brassy yellow color, metallic luster, and relative softness. Often confused with pyrite, but chalcopyrite is softer and has a deeper yellow or iridescent hue.
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