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Hydroxylellestadite

Type Locality
Chichibu mining district (Chichibu mine), Nakatsugawa, Ohtaki-mura, Chichibu City, Saitama Prefecture, Kanto Region, Honshu Island, Japan
Mineral Data
Ca5(SiO4)1.5(SO4)1.5(OH)
Strunz: 
9.AH.25
Physical Properties
Hardness: 
4.5