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Xanthoconite (Photo)

Year of discovery: 1840 (Himmelsfürst mine, Germany), 1968 (Japan)

Locality list: 3 localities of xanthoconite

• Ag₃AsS₃
• [Ag⁺₃][As³⁺][S₃]^6-

• Class: Pyrostilpnite group < Ag sulfosalts < Sulfosalt class
• Class: Sulfosalt

• Polymorph: Proustite (High temperature,Trigonal)

• As => Sb: Pyrostilpnite, Pyrargyrite

• Color: Dark red, Yellow
• Streak: Orange
• Luster: Adamantine
• Diaphaneity: Translucent

• Habit: Tabular on {001}, Lath elongated to [010], Pyramidal, Powder, Pseudo-orthorhombic
• Aggregate: Reniform, Radial
• Twin: {001}, pseudo-orthorhombic

• Cleavage: Distinct on {001} (1 plane)
• Hardness: 2-3
• Density: 5.5

• System: Monoclinic
• Group: 2/m, C2/c
• Lattice: a=12.0, b=6.3, c=17.1, β=110.0

Etymology: Xantho (Yellow), -Con (powder) in Greek