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Creedite

Type Locality
Colorado Fluorspar Co. Mine, Wagon Wheel Gap, Mineral Co., Colorado, USA
Mineral Data
Ca3SO4Al2F8(OH)2·2H2O
Strunz: 
3.CG.15
Physical Properties
Crystal System: 
Monoclinic
Streak: 
white
Hardness: 
4.0
Tenacity: 
brittle