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Petrukite

Year of discovery: 1989 (Herb Claim, Canada), 1987 (Japan)

Locality list: A locality of petrukite

• Cu₃SnS₄
• (Cu,Fe,Zn,Ag)₃(Sn,In)S₈
• [Cu⁺₂][Cu²⁺][Sn⁴⁺][S₄]^8-

• Class: Sulfide

• Polymorph: Kuramite (Tetragonal)

• Cu₃ => Cu₂Fe: Stannite, Ferrokësterite (Ferrokesterite)
• Cu₃ => Cu₂Cd: Černýite (Cernyite)
• Cu₃ => Cu₂Zn: Kësterite (Kesterite)
• Cu₃ => Cu₂Hg: Velikite

• Sn => As: Enargite, Luzonite
• Sn => Sb: Famatinite
• Sn => In: Sakuraiite

• Color: Brown, Gray
• Streak: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Granular

• Cleavage: Distinct on {110}, {100}, and {010} (4 planes)
• Hardness: 4.5
• Density: 4.6

• System: Orthorhombic
• Group: mm2, Pmn2₁
• Lattice: a=7.7, b=6.4, c=6.3

Etymology: William Petruk (1930-), Canadian mineralogist