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Cooperite

Year of discovery: 1928 (Mokopane (Potgietersrus), South Africa, Rustenburg Town & Townlands mine, South Africa), 1976 (Japan)

Locality list: A locality of cooperite

• PtS
• (Pt,Pd,Ni)S
• [Pt⁴⁺][S]

• Class: Cooperite group
• Class: Sulfide

• Polymorph: Braggite (Tetragonal, 4/m)

• Pt => Pd: Vysotskite

• Color: Steel Black
• Streak: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: {001}{110}{111} Granular, elongated to [101]
• Twin: Rare

• Cleavage: Distinct on {011} (2 planes)
• Hardness: 3.5
• Density: 9.5

• System: Tetragonal
• Group: 4/mmm, P4₂/mmc
• Lattice: a=3.5, c=6.1

Etymology: R.A. Cooper from South Africa, who described this mineral for the first time.