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Formula: Ce(CO3)(OH)
Anhydrous carbonate, bastnäsite group,
cerium-bearing mineral, forms a series with
bastnäsite-(Ce)
Crystal System: Hexagonal
Specific gravity: 4.789 calculated
Hardness: 4
Colour: Yellow, light brown
Weakly RADIOACTIVE
Environments
Localities
At the Desmont Mine, Monmouth Township, Highlands East Township, Haliburton County, Ontario, Canada,
hydroxylbastnäsite-(Ce) occurs in veins and lenses in marble.
Associated minerals include stillwellite,
calcite, apatite,
titanite, thorite,
thorianite, uranothorite,
scapolite and tourmaline
(HOM).
At Kamihouri, Kitagawa, Nobeoka, Miyazaki, Japan, hydroxylbastnäsite-(Ce) occurs in a vug in
perthitic
pegmatite. Associated minerals include
beryl, zircon,
xenotime, allanite,
fergusonite, gadolinite and
ilmenite
(HOM).
There are two co-type localities, Mochalin Log, Kyshtym, Chelyabinsk Oblast, Russia, and Vuoriyarvi
alkaline-ultrabasic massif, Northern Karelia, Murmansk Oblast, Russia.
At the Vuoriyarvi alkaline-ultrabasic massif, Northern Karelia, Murmansk Oblast, Russia,
hydroxylbastnäsite-(Ce) occurs in calcite –
dolomite
carbonatite veins in
pyroxenite of an alkalic (containing more sodium and/or potassium than is required
to form feldspar with the available silica)
ultramafic complex. Associated minerals include
baryte, strontianite,
ancylite, fluorite,
pyrrhotite, pyrite,
chalcopyrite, magnetite,
anatase, monazite,
burbankite and quartz
(HOM).
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