Formula: PbCu2Bi4(Se,S,Te)8
Origin of name: for David H. Watkinson (1937-), professor of geology, Carleton University, Ottawa, Canada
Crystal system: Monoclinic
Crystal class: m
Twinning:
Unit cell: a = 12.921, b = 3.997, c = 14.989, β = 109.2°
Colour: Black
Diaphaneity: Opaque
Luster: Metallic
Habit: irregular grains 0.01 to 3 mm
Hardness: 3.5
Specific gravity: 7.82
Cleavage: None
Tenacity: Conchoidal fracture
Streak:
Synonyms/varieties:
Comments:
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