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Tokkoite

Type Locality
Magistral'nyi area, Sirenevyi Kamen' Deposit, Murunskii Massif, Chara and Tokko Rivers Confluence, Aldan Shield, Sakha Republic (Saha Republic; Yakutia), Eastern-Siberian Region, Russia
Mineral Data
K2Ca4Si7O17(O,OH,F)4
Strunz: 
9.DG.75
Physical Properties
Hardness: 
4.0 - 5.0