Formula: Pb10+xSb14-xS31-xClx
Origin of name: For Alexander Stewart Dadson (1906-1958), Canadian mineralogist
Crystal system: Monoclinic
Crystal class: P2, Pm or P2/m
Twinning:
Unit cell:
Colour: Lead-gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Small grains, striated parallel [010]
Hardness: 2.5
Specific gravity: 5.76
Cleavage: None
Tenacity:
Streak: Black
Synonyms/varieties:
Comments: Found in hydrothermal veins with other sulphides and lead sulphosalts
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