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Fergusonite-(Y): YNbO4
Comments: Heavy mass of fergusonite-(Y) with one face polished flat to show the solid interior. Radioactive. Location: Ambatofotsy, Betafo - Antsirabé region, Antananarivo Province, Madagascar. Scale: 6x2.5x1.5 cm. © John Betts - Fine Minerals
Fergusonite-(Y): YNbO4 Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH)
Comments: Brown resinous fergusonite-(Y) (as per communication with Pavel M. Kartashov) with yellowish plumbopyrochlore. Location: Ploskaya Mountain, Keivy Region, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species