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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 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 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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