mineral
Chalcopyrite in Quartz matrix
Chalcopyrite (CuFeS2) with secondary Malachite (Cu2CO3(OH)2)
AI-generated identification · may be incorrectHardness: 3.5-4 (chalcopyrite), 7 (quartz); Color: Brass-yellow (chalcopyrite), Green (malachite staining); Luster: Metallic to dull; Structure: Tetragonal/Amorphous; Specific Gravity: 4.1-4.3
- Hardness
- 3
- Color
- Brass-yellow (chalcopyrite), Green (malachite staining)
- Luster
- Metallic to dull
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Physical properties
Hardness: 3.5-4 (chalcopyrite), 7 (quartz); Color: Brass-yellow (chalcopyrite), Green (malachite staining); Luster: Metallic to dull; Structure: Tetragonal/Amorphous; Specific Gravity: 4.1-4.3
Formation & geological history
Formed in hydrothermal veins and through sulfide mineral precipitation in igneous and metamorphic rocks. The green oxidation indicates weathering of copper-bearing minerals over time.
Uses & applications
Primary ore of copper; occasionally used as collector specimens or for decorative purposes.
Geological facts
Chalcopyrite is often called 'fool's gold,' but it is more yellow and brittle than real gold. It turns green (malachite/azurite) when exposed to moisture and oxygen due to its copper content.
Field identification & locations
Identify by its brassy yellow color and greenish-black streak. Look for it in quartz veins near copper mines or tectonic plate boundaries. Malachite staining is a key indicator of copper presence.
