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Defernite

Type Locality
Güneyce-Ikizdere, Rize Province, Black Sea Region, Turkey
Mineral Data
Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x<0.5)
Strunz: 
5.BA.25
Physical Properties
Crystal System: 
Orthorhombic
Hardness: 
3.0
Tenacity: 
brittle