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Baumhauerite

• Pb₃As₄S₉
• Pb₁₂As₁₆S₃₆
• [Pb²⁺₃][As³⁺₄][S₉]^18-

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

• Color: Dark gray
• Tarnish: Iridescent
• Streak: Dark Brown
• Luster: Metallic
• Diaphaneity: Opaque

• Cleavage: Perfect on {100} (1 plane)
• Hardness: 3
• Density: 5.3

• System: Triclinic (1a), Monoclinic (2a, Baumhauerite-2a) (Unit-cell polytype)
• Group: (-1), P(-1)
• Lattice: a=22.7, b=8.3, c=7.9, α=90.4, β=97.0, γ=90.4