Fergusonite-(Ce)

minerals

aeschynite

bastnasite

parisite

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Formula: CeNbO4.0.3H2O
Multiple oxide containing the rare earth elements niobium Nb and cerium Ce, usually metamict. Tetragonal paramorph of fergusonite-(Ce)-β, which is monoclinic, fergusonite group
Specific gravity: 5.48
Hardness: 5½ to 6½
Streak: reddish brown
Colour: dark red to black
Common impurities: U,Th
Weakly RADIOACTIVE
Environments

Carbonatites
Metamorphic environments

Localities

At Bayan Obo, Inner Mongolia, China, fergusonite-(Ce) occurs in magnesium-rich skarn of the outer granite contact zone of a carbonatite-derived dolomitic marble (HOM). At the type locality, the Chernigovskiy Massif, Zaporizhia Oblast, Ukraine, fergusonite-(Ce) occurs in a carbonatite associated with magnetite, phlogopite, graphite, chlorite, quartz, pyrite, columbite, allanite, bastnäsite, parisite, apatite, aeschynite, fersmite, monazite, calcite and dolomite (HOM, Dana, AM 74.946).

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