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Woodruffite

Type Locality
Passaic pit (Marshall Mine; Passaic Mine), Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA
Mineral Data
Zn(Mn4+,Mn3+)5O10·3½H2O
Strunz: 
4.FL.25
Physical Properties
Streak: 
Brown
Hardness: 
4.5
Tenacity: 
brittle
Photos