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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