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Aenigmatite: (Na,Ca)4(Fe++,Ti,Mg)12Si12O40
Comments: Dark, crystal prism of aenigmatite in white albite with astrophyllite. Location: Mount Eveslogchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species