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Chivruaiite: Ca4(Ti,Nb)5[(Si6O17)2[(OH,O)5]·13-14H2O
Comments: SEM image of radiating aggregate of chivruaiite from a microcline vein in eudialyte-bearing lujavrite. (AmMin, v91, p923). Location: Chivruai River valley, the Lovozero massif, Khibiny massif, Kola peninsula, Russia. Scale: See Image. © American Mineralogist