Formula: TlSbS2
Origin of name: for Byron G. Weissberg (b. 1930), geologist and mineralogist, Chemistry Division, Department of Scientific and Industrial Research, New Zealand.
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 11.9, b = 6.4, c = 6.1, α = 109.9°, β = 81.8°, γ = 105.4°
Colour: Steel-gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Irregular grains, prismatic or tabular grains striated along length, rare, grains 0.005 to 0.5 mm
Hardness: about 1.5
Specific gravity: 5.8-6.1
Cleavage: 4; one perfect, two excellent, one good
Tenacity:
Streak: Dark gray, reddish gray
Synonyms/varieties:
Comments:
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