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Jarosewichite

Type Locality
Buckwheat pit (Southwest opening; Buckwheat Mine), Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
Mineral Data
Mn2+3Mn3+(AsO4)(OH)6
Strunz: 
8.BE.70
Physical Properties
Hardness: 
4.0
Tenacity: 
brittle