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Ikranite: (Na,H3O)15(Ca,Mn,REE)6Fe+++2Zr3([ ],Zr)([ ],Si)Si24O66(O,OH)6Cl·2-3H2O
Comments: Top and bottom images of brownish yellow ikranite aggregate in a green matrix. Location: Lovozero Massif, Kola Peninsula, Russia. Scale: 1 3/4" x 1". © Chris Wright / Wrights Rock Shop