Abstract
Adamsite-(Y), ideally NaY(CO3)2•6H2O, is a newly identified mineral from the Poudrette quarry, Mont Saint-Hilaire, Quebec. It occurs as groups of colorless to white and pale pink, rarely pale purple, flat, acicular to fibrous crystals. These crystals are up to 2.5 cm in length and form spherical radiating aggregates. Associated minerals include aegirine, albite, analcime, ancylite-( Ce), calcite, catapleiite, dawsonite, donnayite-(Y), elpidite, epididymite, eudialyte, eudidymite, fluorite, franconite, gaidonnayit e, galena, genthelvite, gmelinite, gonnardite, horvathite-(Y), kupletskite, leifite, microcline, molybdenite, narsarsukite, natrol ite, nenadkevichite, petersenite-(Ce), polylithionite, pyrochlore, quartz, rhodochrosite, rutile, sabinaite, serandite, siderite, sp halerite, thomasclarkite-(Y), zircon and an unidentified Na– REE carbonate (UK 91). The transparent to translucent mineral has a vitreous to pearly luster and a white streak. It is soft (Mohs hardness 3) and brittle with perfect {001} and good {100} and {010} cleav ages. Adamsite-(Y) is biaxial positive, � = 1.480(4), � = 1.498(2), � = 1.571(4), 2Vmeas. = 53(3)°, 2Vcalc. = 55° and is nonpleochroic.
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