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Fersmanite

Type Locality
Vein No. 1 of Labuntsov, 3rd left tributary of Vuonnemijok river (Astrophillytovyi stream), Eveslogchorr Mt, Khibiny Massif, Kola peninsula, Murmanskaja Oblast', Northern Region, Russia
Mineral Data
Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3
Strunz: 
9.BE.72
Physical Properties
Hardness: 
5.5