mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
AI-generated identification · may be incorrectHardness: 3.5 to 4 on the Mohs scale; Color: Brass-yellow, often with an iridescent tarnish showing purple, blue, and green hues; Luster: Metallic; Crystal Structure: Tetragonal; Cleavage: Indistinct; Specific Gravity: 4.1 to 4.3
- Hardness
- 3
- Luster
- Metallic
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Physical properties
Hardness: 3.5 to 4 on the Mohs scale; Color: Brass-yellow, often with an iridescent tarnish showing purple, blue, and green hues; Luster: Metallic; Crystal Structure: Tetragonal; Cleavage: Indistinct; Specific Gravity: 4.1 to 4.3
Formation & geological history
Formed mainly in hydrothermal veins, associated with high-temperature ore deposits, and in sedimentary and metamorphic rocks worldwide.
Uses & applications
Primary ore of copper, occasionally cut into cabochons or collected as mineral specimens.
Geological facts
Often referred to as 'peacock ore' due to its vibrant tarnish when exposed to weathering or acid. It is frequently confused with pyrite, but is softer and has a deeper yellow or iridescent color.
Field identification & locations
Identify by its brass-yellow color, metallic luster, lower hardness than pyrite (can be scratched with a knife), and distinctive peacock-like tarnish. Found globally in copper-rich mining regions.
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary