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Keldyshite

Type Locality
Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Mineral Data
(Na,H)2ZrSi2O7
Strunz: 
9.BC.10
Physical Properties
Colour: 
White
Hardness: 
3.5 - 4.5
Tenacity: 
very brittle