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Coquandite

Type Locality
Lucky Knock Mine (Lawrence Mine), Whitestone Coulee, Tonasket, Okanogan Co., Washington, USA
Mineral Data
Sb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3)
Strunz: 
7.DE.35
Physical Properties
Crystal System: 
Triclinic
Hardness: 
3.0 - 4.0