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Megacyclite

Type Locality
Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Mineral Data
Na8KSi9O18(OH)9·19H2O
Strunz: 
9.CP.10
Physical Properties
Crystal System: 
Monoclinic
Hardness: 
2.0