Formula: PbCuAsS3
Origin of name: for G., Seligmann, German collector
Crystal system: orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: dark lead-gray to black
Diaphaneity: opaque
Luster: metallic
Habit: crystals equant, short prismatic to tabular, commonly striated, twinned
Hardness: 3
Specific gravity: 5.38 to 5.44
Cleavage: 3; {001}, {100} and {010} poor
Tenacity:
Streak: dark brown to purple-black
Synonyms/varieties:
Comments: series with bournonite
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