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Nelenite

Type Locality
Trotter Mine (Lehigh Mine), Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
Mineral Data
(Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3]
Strunz: 
9.EE.15
Physical Properties
Crystal System: 
Monoclinic
Hardness: 
5.0