chalcocite

Definitions

Examples

• Copper pyrites (or yellow ore), erubescite (or purple ore), and chalcocite (or grey ore) are the most important.

• Chalcocite occurs in vein deposits as one of the important copper ores, especially at Butte, Montana.

• The ore chalcocite, sometimes called copper glance, has a metallic luster, often tarnished green or blue.

• Both chalcocite and chalcopyrite frequently occur in silver-bearing rocks.

• The mineral is harder than chalcocite, but less hard than pyrite, being easily scratched with a knife.