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Fergusonite-(Nd), Ferriallanite-(Ce)


Fergusonite-(Nd) : (Nd,Ce)(Nb,Ti)O4, Ferriallanite-(Ce) : {CaCe}{Fe3+AlFe2+}[O|OH|SiO4|Si2O7]

Photo Copyright © Pavel M. Kartashov photo  - This image is copyrighted. Unauthorized reproduction prohibited.
Locality: Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia
5 mm in diameter segregation of orange-brown ferusonite-(Nd) grains in ferriallanite-(Ce) zone of the vein. Composition of the fergusonite is (Nd.40Ce.20Sm.08Pr.04Gd.03La.03Eu.02Ca.06Th.01)0.87Nb1O3.57(OH)0.43 . Usually it is overgrown by black micrograins of new mineral phaze Ce(Fe",Nb,Ti)SiO5. Main black inclusions are ferriallanite-(Ce) crystals. White matrix is mixture of calcian strontianite and strontian calcite. Tornebohmite vein. Selfcollected in August of 2004. Pavel M. Kartashov analyses, collection and photo.

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