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Nafertisite: Na3(Fe++,Fe+++)6(Ti2Si12O34)(O,OH)7·2(H2O)
Comments: Dark green fibrous nafertisite masses in pegmatite rock. Location: Mount Kukisvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species