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Clinoclase

Type Locality
Wheal Gorland, St Day United Mines (Poldice Mines), Gwennap, Camborne - Redruth - St Day District, Cornwall, England, UK
Mineral Data
Cu3(AsO4)(OH)3
Strunz: 
8.BE.20
Physical Properties
Crystal System: 
Monoclinic
Hardness: 
2.5 - 3.0
Tenacity: 
brittle