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Formula: NaY(CO3)2.6H2O
Carbonate, yttrium-bearing mineral
Crystal System: Triclinic
Specific gravity: 2.27 measured, 2.27 calculated
Hardness: 3
Streak: White
Colour: Colourless, white, pale pink, pale purple.
Common impurities: Gd,Nd,Yb,Sm,Ho
Environments
Pegmatites
Hydrothermal environments
Localities
At the type locality, the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada,
adamsite-(Y) occurs as a late-stage, low-temperature hydrothermal phase within cavities in a large alkaline
pegmatite dike. Minerals found in that portion of the dike in which
adamsite-(Y) was discovered include aegirine,
albite, analcime,
ancylite-(Ce), calcite,
catapleiite, dawsonite,
donnayite-(Y), elpidite,
epididymite, eudialyte,
eudidymite, fluorite,
franconite, gaidonnayite,
galena, genthelvite,
gmelinite, gonnardite,
horváthite-(Y), kupletskite,
leifite, microcline,
molybdenite, narsarsukite,
natrolite, nenadkevichite,
petersenite-(Ce),
polylithionite, pyrochlore,
quartz, rhodochrosite,
rutile, sabinaite,
serandite, siderite,
sphalerite,
thomasclarkite–(Y) and zircon.
Adamsite-(Y) occurs as a very late-stage, low temperature, hydrothermal phase within cavities in an alkaline
pegmatite dike in the
nepheline syenite intrusion. In these cavities,
adamsite-(Y) appears to crystallise after rhodochrosite and
petersenite-(Ce), is contemporaneous with
horváthite-(Y) and
donnayite-(Y), and precedes
thomasclarkite–(Y), which has been observed as an epitactic growth
on adamsite-(Y)
(CM 38.1457-1466).
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