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Copper pyrites (or yellow ore), erubescite (or purple ore), and chalcocite (or grey ore) are the most important.A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer
Chalcocite occurs in vein deposits as one of the important copper ores, especially at Butte, Montana.Geology|William J. Miller
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.