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Hennomartinite

Type Locality
Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese field, Northern Cape Province, South Africa
Mineral Data
SrMn3+2(Si2O7)(OH)2·H2O
Strunz: 
9.BE.05
Physical Properties
Crystal System: 
Orthorhombic
Hardness: 
4.0