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Franckeite

Year of discovery: 1893 (Chocaya mine, Bolivia), 1939 (Japan)

Locality list: 3 localities of franckeite

• FePb₆Sn₂Sb₂S₁₄
• Fe(Pb,Sn²⁺)₆Sn₂Sb₂S₁₄
• [Fe²⁺][Pb²⁺₆][Sn⁴⁺₂][Sb³⁺₂][S₁₄]^28-

• Class: Cylindrite group < Pseudohexagonal-Tetragonal layered Pb sulfosalts < Sulfosalt class
• Class: Sulfosalt
• Variety: Incaite (+Sn²⁺)
• Variety: Potosíite (-Sn⁴⁺)
• Soluble in: HNO₃ (Decompose), Aqua regia

• Color: Grayish black-Black
• Streak: Grayish black
• Luster: Metallic
• Diaphaneity: Opaque

• Cleavage: Perfect on {010} (1 planes)
• Hardness: 2.5-3
• Density: 5.9

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=46.9, b=5.8, c=17.3, α=90.0, β=94.7, γ=90.0