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Chalcophanite

Type Locality
Passaic pit (Marshall Mine; Passaic Mine), Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA
Mineral Data
(Zn,Fe,Mn)Mn3O7·3H2O
Strunz: 
4.FL.20
Physical Properties
Crystal System: 
Trigonal
Hardness: 
2.5