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Gustavite

Year of discovery: 1970 (Ivigtut deposit, Greenland), 1972 (Japan)

Locality list: 16 localities of gustavite

• AgPbBi₃S₆
• [Ag⁺][Pb²⁺][Bi³⁺₃][S₆]^12-

• Class: Lillianite subgroup < Lillianite group < Large 2D fragment Pb sulfosalts < Sulfosalt class
• Class: Sulfosalt

• AgBi => Pb₂: Lillianite (Series), Xilingolite

• Bi => Sb: Andorite VI

• Color: Silver gray
• Streak: Gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Tabular
• Aggregate: Intergrowth with benjaminite

• Cleavage: Imperfect
• Hardness: 3.5
• Density: 7.0

• System: Orthorhombic
• Group: mmm, Bbmm
• Lattice: a=13.5, b=19.4, c=4.1

Etymology: Gustav Adolf Hageman, Greenlander chemical engineer