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Charlesite

Type Locality
Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
Mineral Data
Ca6(Al,Si)2(SO4)2[B(OH)4](OH,O)12·26H2O
Strunz: 
7.DG.15
Physical Properties
Streak: 
White
Hardness: 
2.5
Tenacity: 
brittle