Adamsite-(Y)

adamsite-(Y)

horvathite-(Y)

donnayite-(Y)

thomasclarkite-(Y)

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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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