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Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH) Columbite-(Mn): (Mn,Fe++)(Nb,Ta)2O6
Comments: Yellow-brown plumbopyrochlore crystalline crust over black manganocolumbite grain. Such plumbopyrochlore-manganocolumbite ovoids with different grade of replacement are very typical for the locality. Location: Amazonite pegmatites of Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 12x10 mm. © Pavel M. Kartashov
Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH) Columbite-(Fe): Fe++Nb2O6
Comments: Brown plumbopyrochlore crystal with dark brown ferrocolumbite (columbite-(Fe)). Location: Holdazan, Buregteg, Mongolia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH) Fergusonite-(Y): YNbO4
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