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Comments: Prismatic crystals of black arfvedsonite in white feldspar matrix.
Location: Kangerdluarsuk, Ilímaussaq Massif, Greenland.
Scale: 8x3x3 cm.
© John Betts - Fine Minerals
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