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Hutchinsonite

Year of discovery: 1904 (Lengenbach quarry, Switzerland), 1997 (Japan)

Locality list: A locality of hutchinsonite

• TlPbAs₅S₉
• (Tl,Pb)₂As₅S₉
• [Tl⁺][Pb²⁺][As³⁺₅][S₉]^18-

• Class: Hutchinsonite group < Layered Tl-Hg sulfosalts < Sulfosalt class
• Class: Sulfosalt

• Color: Red, Dark red
• Streak: Red
• Luster: Adamantine
• Diaphaneity: Opaque

• Habit: Prismatic, Acicular elongated to [001]
• Aggregate: Radial

• Cleavage: Good on {010} (1 plane)
• Hardness: 1.5-2
• Density: 4.7

• System: Orthorhombic
• Group: mmm, Pbca
• Lattice: a=10.8, b=35.4, c=8.2

Etymology: Prof. Arthur Hutchinson (1866-1937), British mineralogist