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Formula CaY(CO3)2F
Anhydrous carbonate, synchysite group,
yttrium-bearing mineral
Specific gravity: 3.89 to 4.1
Hardness: 6 to 6½
Streak: Light brown
Colour: White, reddish brown, greyish yellow, dull yellow; colourless to light yellow in transmitted light
Solubility: Readily soluble in acids
Environments:
Pegmatites
Carbonatites
Hydrothermal environments
Synchysite-(Y) occurs in pegmatites, in carbonatites and in alpine fissure-type veins, where it is typically
accompanied by
other rare-earth minerals and quartz,
albite, the
TiO2 paramorphs
(rutile, anatase and
brookite) and
chlorite
(HOM, MW).
Localities
At Beddgelert Forest, Beddgelert, Gwynedd, Wales, UK, synchysite-(Y) has been found in altered
rhyolite as radiating sheaves intergrown with
quartz and K-feldspar
(MW).
At Dover, Morris county, New Jersey, USA, synchysite-(Y) is associated with
kainosite-(Y),
bastnäsite, xenotime,
hematite and quartz
(HOM).
At its type locality, the Scrub Oaks Mine, Mine Hill Borough, Morris county, New Jersey, USA, synchysite-(Y)
occurs in aggregates mixed with xenotime,
hematite and
quartz. Most of the aggregates have rims of
bastnäsite
(AM 45.92-98).
(Dana).
Synchysite-(Y) -
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