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Langite

Type Locality
Fowey Consols (incl. Wheal Treasure; Wheal Fortune; Wheal Chance), Tywardreath, St Austell District, Cornwall, England, UK
Mineral Data
Cu4(SO4)(OH)6·2H2O
Strunz: 
7.DD.10
Physical Properties
Crystal System: 
Monoclinic
Hardness: 
2.5 - 3.0