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Semseyite

Year of discovery: 1881 (Baia Sprie mine (Felsőbánya mine), Romania), 1961 (Japan)

Locality list: 3 localities of semseyite

• Pb₉Sb₈S₂₁
• [Pb²⁺₉][Sb³⁺₈][S₂₁]^42-

• Class: Plagionite group < Large 2D fragment Pb sulfosalts < Sulfosalt class
• Class: Sulfosalt

• Pb => Ag₂: Rayite

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

• Habit: Tabular on {001}, Prismatic elongated to [010], [-401] or [-201]
• Aggregate: Rosette, Radial, Grobule

• Cleavage: Perfect on {112} (1 plane)
• Hardness: 2.5
• Density: 6.0

• System: Monoclinic
• Group: 2/m, C2/c
• Lattice: a=13.6, b=12.0, c=24.5, β=105.9

Etymology: Andor von Semsey (1833-1923), Hungarian mineral collector