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Leadhillite

Type Locality
Susanna Mine (Glennery Scar Vein; Susanna Vein [Scar Vein]; Portobello Vein; Humby Vein; Lead Vein), Leadhills, South Lanarkshire, Strathclyde (Lanarkshire), Scotland, UK
Mineral Data
Pb4(CO3)2(SO4)(OH)2
Strunz: 
5.BF.40
Physical Properties
Crystal System: 
Monoclinic
Streak: 
White
Hardness: 
2.5 - 3.0
Tenacity: 
brittle