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Seidite-(Ce): Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4·5(H2O)
Comments: Scanning Electron image of seidite-(Ce) with the axial components of a and c superimposed on crystal. Location: Yubileynaya pegmatite at Mount Karnasurt, Lovozero alkaline massif, Kola Peninsula, Russia. Scale: Image size 0.5 mm. © Canadian Mineralogist