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Geerite

Year of discovery: 1980 (De Kalb Township, USA), 2002 (Japan)

Locality list: A locality of geerite

• Cu₈S₅
• [Cu²⁺₈][S₅]

• Class: Chalcocite group
• Class: Sulfide

• Color: Gray, Bluish gray
• Luster: Metallic
• Diaphaneity: Opaque

• Aggregate: Filform

• Hardness: 3.5-4
• Density: 5.6

• System: Trigonal, Pseudocubic
• Group: (-3), R(-3)
• Lattice: a=3.8, c=46.8

Etymology: Adam Geer, American who discovered this mineral for the first time.