Images
Formula: NdNbO4
Niobate, neodymium-bearing
mineral
Crystal System: Tetragonal
Hardness: 5½ to 6½
Colour: Dark brown
Environments
Sedimentary environments
Metamorphic environments
Fergusonite-(Nd) is probably a valid mineral species, but it has never been submitted to the IMA (as of August
2025).
Localities
Originally described, in 1981, from the Bayan Obo deposit, Bayan Obo, Darhan Muminggan United Banner, Baotou League, Nei
Mongol Autonomous Region, China. Fergusonite-(Nd) formed at a late stage in the
rare earth deposit, where it occurs in
aegirine veinlets as dark brown, granular or equant grains with an
adamantine lustre; it is typically metamict
(AM 74.946-947).
At Ust'-Biraya, Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area, Vitim Plateau, Irkutsk Oblast,
Russia, fergusonite-(Nd) occurs with ferriallanite-(Ce)
(Mindat photo).
Fergusonite-(Nd) - Image
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