mineral
Copper Ore with Malachite and Chalcocite
Copper-bearing Mineral Assemblage (Cu2CO3(OH)2 + Cu2S)
Hardness: 3.5-4 (Malachite), 2.5-3 (Chalcocite); Color: Green coating, dark metallic gray to black matrix; Luster: Silky to earthy green, metallic black; Crystal structure: Monoclinic/Orthorhombic; Specific Gravity: 3.6-4.0 (Malachite), 5.5-5.8 (Chalcocite)
- Hardness
- 3
- Color
- Green coating, dark metallic gray to black matrix
- Luster
- Silky to earthy green, metallic black
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Physical properties
Hardness: 3.5-4 (Malachite), 2.5-3 (Chalcocite); Color: Green coating, dark metallic gray to black matrix; Luster: Silky to earthy green, metallic black; Crystal structure: Monoclinic/Orthorhombic; Specific Gravity: 3.6-4.0 (Malachite), 5.5-5.8 (Chalcocite)
Formation & geological history
Forms in the oxidation zone of copper sulfide deposits. These minerals result from the weathering of primary copper ores like chalcopyrite through interaction with carbonated water and oxygen over thousands of years.
Uses & applications
Major source of copper metal; also used for mineral collecting, pigment manufacturing, and occasionally as minor gemstone material if high grade.
Geological facts
Malachite is often used as an indicator for prospectors looking for copper. Historically, it was used as a green pigment in paintings until the 1800s. Its vibrant green color comes from the copper content within its chemical structure.
Field identification & locations
Identified by the distinct green oxidation (malachite) on a heavy, dark, often metallic-flecked rock. It is commonly found in copper mining districts like Arizona (USA), Congo, and Chile. Tips: check for a green streak and heavy weight relative to size.
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