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Kuliokite-(Y): (Y,REE)4Al(SiO4)2(OH)2F5
Comments: White encrustations of kuliokite-(Y) grains on pegmatite. Location: Ploskaya Mt., Western Keivy, Kola Peninsula, Russia. Scale: Specimen Size 14x10x8 mm. © Sergey Vasiliev / Systematic Mineralogy