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Butlerite

Type Locality
United Verde Mine (The Big Hole; Big Hole property; Hull Mine; Hopewell tunnel; Patented claim 3480; Patented claim 2812; Patented claims 3348), Jerome, Verde District, Black Hills (Black Hill Range), Yavapai Co., Arizona, USA
Mineral Data
Fe3+(SO4)(OH)·2H2O
Strunz: 
7.DC.10
Physical Properties
Hardness: 
2.5