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Formula: (Y,Ca)5(SiO4)3F
Nesosilicate (insular SiO4 groups), britholite group,
apatite supergroup
Specific gravity: 4.609 calculated
Hardness: 5½
Streak: Pale brownish to almost white
Colour: Light pinkish brown to brownish pink, light brown, dark brown
Environments
Plutonic igneous environments
Pegmatites
Localities
There are three Co-Type Localities for fluorbritholite-(Y), Kråkmo, Hamarøy, Nordland, Norway, Lagmannsvik, Hamarøy, Nordland, Norway and
Vyuntspakhk Mt, Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia.
At Lagmannsvik and Kråkmo, Hamarøy, Nordland, Norway, fluorbritholite-(Y) occurs in alkaline
granite related pegmatites
(Mindat).
At Kråkmo, Hamarøy, Nordland, Norway, fluorbritholite-(Y) is associated with
fluorapatite, quartz,
fluorite and allanite-(Ce)
(HOM).
At Lagmannsvik, Hamarøy, Nordland, Norway, fluorbritholite-(Y) occurs in pegmatite cutting alkaline
granite as irregular grains and
crystals up to 1 mm embedded in granular aggregates of of cream coloured yttrium-bearing fluorite
and allanite-(Ce).
Associated minerals include yttrium-bearing fluorite,
allanite-(Ce), quartz,
magnetite, fluorapatite,
aluminocerite-(Ce), bastnäsite-(Ce),
britholite-(Y), gadolinite-(Y),
hundholmenite-(Y),
thalénite-(Y),
kainosite-(Y) and tengerite-(Y)
(HOM, Mindat).
At Vyuntspakhk Mt, Western Keivy Massif, Keivy Mountains, Murmansk Oblast, Russia, fluorbritholite-(Y) occurs
in an amazonite-bearing
pegmatite vein
(Mindat).
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