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Arfvedsonite: NaNa2(Fe++4Fe+++)Si8O22(OH)2 Seidozerite: (Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2
Comments: Dark red translucent seidozerite with vitreous, black arfvedsonite. Location: Seidozero Lake, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Arfvedsonite: NaNa2(Fe++4Fe+++)Si8O22(OH)2
Comments: Prismatic crystals of black arfvedsonite in white feldspar matrix. Location: Kangerdluarsuk, Ilímaussaq Massif, Greenland. Scale: 8x3x3 cm. © John Betts - Fine Minerals