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Boulangerite

Year of discovery: 1837 (Molières, France), 1947 (Japan)

Locality list: 32 localities of boulangerite

• Pb₅Sb₄S₁₁
• [Pb²⁺₅][Sb³⁺₄][S₁₁]^2-

• Class: Boulangerite group < Rod-type Pb sulfosalts < Sulfosalt class
• Class: Sulfosalt
• Soluble in: HCl (By heating)
• Difficult to distinguish from Jamesonite without analytical instruments.

• Polymorph: Falkmanite

• Color: Dull Lead gray
• Streak: Grayish grown
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Acicular
• Striation: [100]

• Cleavage: Perfect on {100} (1 plane)
• Hardness: 2.5-3
• Density: 6.2

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=21.6, b=23.5, c=8.1, a^c=100.8

Etymology: Charles Louis Boulanger (1810-1849), French mining engineer