Eudialyte is an uncommon ore of zirconium which forms in alkaline igneous rocks, such as nepheline syenites. Eudialyte is as a minor gemstone, but this use is limited by its rarity, which is compounded by its poor crystal habit. Eudialyte's rarity makes locality useful in its identification. Prominent localities of eudialyte include Mont Saint-Hilaire in Canada, Kola Peninsula in Russia and Poços de Caldas in Brazil.
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