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Denisovite: (K,Na)Ca2Si3O8(F,OH)
Comments: Grayish-white fibrous denisovite. Location: Eveslogchorr Mt , Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag