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Madocite

Year of discovery: 1965 (Taylor Pit, Canada), 1983 (Japan)

Locality list: A locality of madocite

• Pb₁₇Sb₁₆S₄₁
• Pb₁₇(Sb,As)₁₆S₄₁
• [Pb²⁺₁₇][Sb³⁺₁₆][S₄₁]^82-

• Class: Rod-type Pb sulfosalts < Sulfosalt class
• Class: Sulfosalt

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

• Habit: Prismatic elongated to [001]
• Striation: [001]

• Cleavage: Perfect on {010} (1 plane)
• Hardness: 3
• Density: 6.0

• System: Orthorhombic
• Group: mm2, Pb2a
• Lattice: a=27.2, b=34.1, c=4.1

Etymology: Madoc district in Canada