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Formula: NdNbO4
Multiple oxide containing the rare earth elements niobium and
neodymium, usually metamict
Crystal System: Monoclinic
Specific gravity: 6.45 measured
Hardness: 5½ to 6½
Streak: pale brown
Colour: red, brownish red, yellowish brown
Common impurities: U,Th
Weakly RADIOACTIVE
Environments
Carbonatites
Metamorphic environments
Clinofergusonite-(Nd) occurs in sodium-metasomatized carbonatite-derived dolomitic
marble
(Webmin).
Localities
At the type locality, the West Mine, Bayan Obo deposit, Baotou League, Inner Mongolia, China, clinofergusonite-(Nd) occurs in a
niobium-rare earth deposit in riebeckitised
dolomite associated with riebeckite, ferroan
dolomite, biotite,
magnetite, monazite,
bastnäsite, aeschynite-(Nd),
ilmenite, pyrite and
fergusonite-(Ce)
(Dana, AM 69.406-407).
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