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Luzonite

Year of discovery: 1874 (Lepanto mine, Philippines), 1943 (Japan)

Locality list: 28 localities of luzonite

• Cu₃AsS₄
• [Cu²⁺₃][As³⁺][S₄]

• Class: Luzonite group
• Class: Sulfide

• Polymorph: Enargite (Orthorhombic)

• As => Sb: Famatinite (Series)
• As => In: Sakuraiite
• As => Sn: Petrukite, Kuramite

• Color: Dark pinkish brown
• Tarnish: Dark gray
• Streak: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Massive
• Twin: {112}

• Cleavage: Good on {101} (2 planes), Distinct on {100} (1 plane)
• Hardness: 3.5
• Density: 4.4

• System: Tetragonal
• Group: (-4)2m, I(-4)2m
• Lattice: a=5.3, c=10.5

Name: Luzon island in Philippines