Formula: Y4Al(SiO4)2(OH)2F5
Nesosilicate (insular SiO4 groups), yttrium-bearing mineral
Crystal System: Triclinic
Specific gravity: 4.3 measured, 4.26 calculated
Hardness: 4 to 5
Streak: White
Colour: Colourless
Environments
Kuliokite-(Y) occurs as inclusions in fluorite or on fissures
in microcline pegmatites, associated with
thalénite-(Y), xenotime-(Y),
kainosite-(Y),
bastnäsite, keiviite-(Y),
keiviite-(Yb), quartz and
fluorite (HOM, Dana). It alters to
kamphaugite-(Y), kainosite-(Y)
and tengerite-(Y)
(Dana).
Localities
At Hoydalen, Tordal, Norway, kuliokite-(Y) occurs in
amazonite-bearing pegmatites
(Dana).
At the type locality, the Ploskaya Mountain, Western Keivy Massif, Lovozersky District, Murmansk Oblast, Russia,
kuliokite-(Y) occurs in amazonite-bearing pegmatites as
inclusions in fluorite or as platy crystals in fissures in
fluorite and quartz.
Associated minerals include thalénite-(Y),
xenotime, kainosite-(Y)
and bastnäsite
(AM 73.192).
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