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Cornwallite

Type Locality
Wheal Gorland, St Day United Mines (Poldice Mines), Gwennap, Camborne - Redruth - St Day District, Cornwall, England, UK
Mineral Data
Cu5(AsO4)2(OH)4
Strunz: 
8.BD.05
Physical Properties
Crystal System: 
Monoclinic
Hardness: 
4.5
Tenacity: 
brittle
Synonyms
Synonyms: 
Cornwallita