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Freieslebenite

Year of discovery: 1845 (Himmelsfürst mine, Germany), 1937 (Japan)

Locality list: 11 localities of freieslebenite

• AgPbSbS₃
• [Ag⁺][Pb²⁺][Sb³⁺][S₃]^6-

• Class: Freieslebenite group < Ternary sulfosalts < Sulfosalt class
• Class: Sulfosalt
• Soluble in: HCl (Slightly)

• Sb => As: Marrite

• Color: Gray-Dark gray
• Streak: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Prismatic elongated to [001]
• Twin: {100}

• Cleavage: {010} Imperfect (1 plane)
• Hardness: 2.5
• Density: 6.2

• System: Monoclinic
• Group: 2/m, P2₁/n
• Lattice: a=7.5, b=12.8, c=5.9, β=92.3

Etymology: Johann Karl Freiesleben (1774-1846), German mine owner