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Dufrénoysite, Dufrenoysite

Year of discovery: 1845 (Lengenbach quarry, Switzerland), 2000 (Japan)

Locality list: A locality of dufrénoysite

• Pb₂As₂S₅
• [Pb²⁺₂][As³⁺₂][S₅]^10-

• Class: Dufrénoysite subgroup (Dufrenoysite subgroup) < Sartorite group < Large 2D fragment Pb sulfosalts < Sulfosalt class
• Class: Sulfosalt

• As => Bi: Cosalite
• As => Sb: Veenite (Series), Plumosite

• Color: Grayish Black
• Streak: Reddish brown
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Tabular elongated to [001] or [010]
• Striation: [001] on (010)
• Twin: {001}

• Cleavage: Perfect on {010} (1 planes)
• Hardness: 3
• Density: 5.6

• System: Monoclinic
• Group: 2/m, P2₁/m
• Lattice: a=7.9, b=25.7, c=8.4, β=90.3

Etymology: Pierre Armand Petit Dufrenoy (1792-1857) of mining school in France