Euxenite-(Y)

oxide

polycrase

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
Specific gravity: 5.3 to 5.9
Hardness: 5½ to 6½
Streak: Yellowish, grayish, reddish brown
Colour: Black, greenish or brownish tint at times
Environments

Pegmatites

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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