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Formula: Ce(SiO4)
Nesosilicate (insular SiO4 groups), zircon group
Crystal System: Tetragonal
Specific gravity: 5.03 calculated
Hardness: 4 to 5
Streak: White
Colour: Pale yellow to colourless
Environments
Localities
At the type locality, the Stetind pegmatite, Narvik, Nordland, Norway, stetindite-(Ce) occurs in cavities in
massive yttrian fluorite in the
granite pegmatite,
a product of a fluorine-rich fluid formed via liquid immiscibility during the cooling of the
pegmatite magma. Twenty-five rare earth elements have been
found as inclusions in this yttrian
fluorite, stetindite-(Ce) being one of them. It occurs as diverging
aggregates of acicular, often tapered, crystals, up to 1.5 mm in length and 0.05 mm thick. Associated minerals include
hematite,
hundholmenite-(Y), quartz, törnebohmite-(Ce),
vyuntspakhkite-(Y),
calcioancylite-(Nd), kozoite-(Nd) and Nd-rich bastnåsite, and also
allanite-(Ce), bastnåsite-(Ce),
fluorine-rich britholite-(Y),
calcioancylite-(Ce),
keiviite-(Y), keiviite-(Yb),
kuliokite-(Y),
rowlandite-(Y),
thalénite-(Y), thorite,
uraninite, uranophane-beta,
yttrialite-(Y) and zircon
(AM 95.207)
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