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Roeblingite

Type Locality
Parker Mine (Parker shaft), Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
Mineral Data
Pb2Ca6Mn2+(Si3O9)2(SO4)2(OH)2·4H2O
Strunz: 
9.CB.05
Physical Properties
Streak: 
White
Hardness: 
3.0