Multiple oxide, euxenite group
Specific gravity: 4.9 to 5.1
Hardness: 5 to 6
Streak: Yellowish, greyish, reddish brown
Common impurities: Ca,Ce,U,Th,Ta
Polycrase-(Y) is found in K-rich granite pegmatites, and rarely as a
detrital mineral. Associated minerals include monazite,
allanite, zircon and
(Dana, HOM ). It is usually metamict, and only very rarely, crystalline samples with incipient metamictisation have
Well crystallised polycrase-(Y) is found in numerous localities in the Ankazobe District, Analamanga, Madagascar, in K-rich pegmatites with beryl, columbite, monazite and pyrochlore group minerals (Dana).
The type locality is the Rasvåg feldspar quarries, Hidra, Flekkefjord, Agder, Norway.
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