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Digenite [abbr. Dg ]

Year of discovery: 1844 (Sangerhausen, Germany), 1951 (Japan)

Locality list: 47 localities of digenite

• Cu₉S₅
• [Cu²⁺₉][S₅]

• Class: Chalcocite group
• Class: Sulfide
• Phase transition: Formed on transition of powdered Anilite.

• Polymorph: Roxbyite (Monoclinic)

• Color: Dark gray
• Tarnish: Bluish black
• Streak: Dark gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Pseudocubic
• Aggregate: Co-crystallized with other copper sulfide
• Twin: (-101)

• Cleavage: No but perfect on {111} (4 planes) for artificial crystal
• Hardness: 2.5-3
• Density: 5.5

• System: Trigonal, Pseudocubic
• Group: (-3)m, R(-3)m
• Lattice: a=3.9, c=48.0

Etymology: Two species or sex in Greek