Formula: Pb6Bi8(S,Se)18
Origin of name: for Kristian Oskar Mats Weibull (1856-1923), Swedish mineralogist, first analyst of mineral
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 15.39, b = 4.068, c = 53.8
Colour: Steel-gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals prismatic, indistinct, massive, foliated or fibrous to prismatic
Hardness: 2 -2.5
Specific gravity: 6.97-7.15
Cleavage: 1; parallel to elongation good
Tenacity: Brittle
Streak: Dark steel-gray
Synonyms/varieties:
Comments:
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