Adamsite-(Y), Thomasclarkite-(Y), Horvarthite-(Y). Type locality specimen from Canada.
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Specimen covered by 3 type locality mineral species, Adamsite-(Y), Thomasclarkite-(Y) and few Horvarthite-(Y) crystals. Collected in October 1999 from the Gaidonnayite pegmatite.
Locality: Poudrette Quarry, Mont-Saint-Hilaire, Quebec Province, Canada (type locality for Adamsite-(Y), Thomasclarkite-(Y) and Horvarthite-(Y)).
Specimen size: miniature. 5.7 x 4 x 3.7 cm.
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