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Fenaksite

Type Locality
Material'naya Adit, Yukspor Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Mineral Data
(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)
Strunz: 
9.DG.70
Physical Properties
Hardness: 
5.0 - 5.5