mineral
Copper Ore with Chalcocite
Copper sulfide (Cu2S) with associated copper-bearing minerals
Hardness: 2.5-3; Color: Dark grey to black with metallic blue tints and earthy green oxidation; Luster: Sub-metallic to dull; Crystal structure: Orthorhombic; Specific Gravity: 5.5-5.8
- Hardness
- 2
- Luster
- Sub-metallic to dull
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Physical properties
Hardness: 2.5-3; Color: Dark grey to black with metallic blue tints and earthy green oxidation; Luster: Sub-metallic to dull; Crystal structure: Orthorhombic; Specific Gravity: 5.5-5.8
Formation & geological history
Formed in the supergene enrichment zone of copper deposits, where groundwater dissolves copper from upper levels and redeposits it as secondary minerals below the water table.
Uses & applications
Primary source of copper metal; also used for educational and geological study and collected as mineral specimens.
Geological facts
Chalcocite is one of the most profitable copper minerals because of its high copper content (nearly 80% by weight) and the ease with which copper can be separated from the sulfur.
Field identification & locations
Identify by high density (heavy for its size), dark sooty appearance, and the presence of green or blue secondary copper ores. Frequently found in copper mining districts like Arizona, USA, or Cornwall, UK.
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