1. A mineral form of copper sulfide (Cu₂S) that is an important ore of copper, typically occurring as dark gray or black crystals.
Usage: mineralogy; also called copper glance

Examples

• Chalcocite is one of the primary ores mined for copper extraction.
• The dark metallic luster of chalcocite makes it easily recognizable in mineral collections.
• Geologists identified chalcocite deposits in the rock formation.
• Chalcocite crystals often form in the enriched zones of copper ore bodies.
• The chemical formula of chalcocite is Cu₂S.