mineral

Copper Ore with Chalcocite

Copper sulfide (Cu2S) with associated copper-bearing minerals

AI-generated identification · may be incorrect

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

Identified July 20, 2026More mineral →

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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.