Formula: PbTl(Cu,Ag)As2S5
Origin of name: locality Valais (Wallis) Canton, Switzerland, the German name for the Swiss Canton in which the Lengenbach quarry is located.
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 7.98, b = 8.979, c = 7.761, α = 106.11°, β = 114.48°, γ = 65.48°
Colour: Lead-gray, black
Diaphaneity: Opaque
Luster: Metallic
Habit: Massive
Hardness:
Specific gravity: 5.71
Cleavage: 1; {001} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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