1.85" Eudialyte With Aegirine - Kukisvumchorr Mountain, Russia

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