Formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Multiple oxide containing niobium, tantalum and titanium; forms series with polycrase-(Y)
and also with columbite; metamict
Crystal System: Orthorhombic
Specific gravity: 5.3 to 5.9 measured, 5.16 calculated
Hardness: 5½ to 6½
Streak: Yellowish, grayish, reddish brown
Colour: Black, greenish or brownish tint at times
Environments
Euxenite-(Y) is a rare-earth mineral that occurs in granite pegmatites and also
as a component of detrital black sands (Webmin, HOM).
Associated minerals include albite, microcline,
biotite, muscovite,
ilmenite, monazite,
xenotime, zircon,
beryl, magnetite,
garnet, allanite,
gadolinite, aeschynite-(Y),
thorite, uraninite and
columbite (HOM).
At the Gole quarry, Murchison township, Ontario, Canada, euxenite-(Y) is associated with
fergusonite-(Y) (Dana).
The type locality is a pegmatite at Jølster, Sogn og Fjordane, Norway.
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