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Formula: Y(Al,Si)(SiO4)(OH,O)2
Sorosilicate (Si2O7 groups), yttrium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.02 measured, 4.07 calculated
Hardness: 6 to 7
Colour: Colourless to tan
Luminescence: Not fluorescent, very pale yellow-green cathodoluminescence (Dana)
Solubility: Insoluble in hydrochloric acid
Environments
Localities
At the Stetind pegmatite, Narvik, Nordland, Norway, vyuntspakhkite-(Y) has been found associated with
stetindite
(AM 95.207).
At Tysfjord, Nordland, Norway, vyuntspakhkite-(Y) has been found associated with
cayalsite-(Y)
(AM 101.1920).
At the type locality, Ploskaya Mt, Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia,
vyuntspakhkite-(Y) occurs as two generations of crystals in in small cavities in violet
fluorite in amazonite
pegmatite. The crystals are slender prismatic, 0.5 to 0.7 mm
long and 0.05-0.2 mm thick. Associated minerals include fluorite,
gadolinite, xenotime and
bastnäsite
(AM 69.1190-1196, HOM).
It is also found with kenoplumbomicrolite
(AM 106.1189).
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