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Itoigawaite

Type Locality
Itoigawa City, Niigata Prefecture, Chubu Region, Honshu Island, Japan
Mineral Data
SrAl2(Si2O7)(OH)2·H2O
Strunz: 
9.BE.05
Physical Properties
Crystal System: 
Orthorhombic
Hardness: 
5.0 - 5.5