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Seidozerite

Type Locality
Pegmatite No. 58, Muruai and Uel'kuai rivers, Seidozero Lake, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Mineral Data
Na8Mn2+2Zr3Ti3(Si2O7)4O4F4
Strunz: 
9.BE.25
Physical Properties
Hardness: 
4.0 - 5.0