mineral
Copper Ore (with Malachite/Chrysocolla and Iron Oxides)
Secondary Copper Minerals (Cu2(CO3)(OH)2 / (Cu,Al)2H2Si2O5(OH)4·nH2O)
Hardness: 2.5-4.0 (for copper silicates/carbonates); Color: Green to turquoise blue with brown/orange iron staining; Luster: Dull, earthy to waxy; Texture: Fine-grained, microcrystalline, or massive.
- Hardness
- 2
- Color
- Green to turquoise blue with brown/orange iron staining
- Luster
- Dull, earthy to waxy
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Physical properties
Hardness: 2.5-4.0 (for copper silicates/carbonates); Color: Green to turquoise blue with brown/orange iron staining; Luster: Dull, earthy to waxy; Texture: Fine-grained, microcrystalline, or massive.
Formation & geological history
Formed in the oxidation zones of copper deposits where primary copper minerals are weathered by oxygen-rich groundwater. Found in arid regions with hydrothermal mineralization.
Uses & applications
Primary source of copper metal through smelting; also used as semi-precious gemstones for jewelry or as decorative carvings when concentrated.
Geological facts
This specimen displays 'gossan' characteristics, which are the rusted outcrops that miners historically used as signs to find valuable ore deposits deeper below the surface.
Field identification & locations
Identified by its distinctive blue-green staining against a dark or rusty matrix. Commonly found in copper mining districts like Arizona, NV (USA), Congo, and Chile.
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