Alluaivite
Alluaivite is a rare mineral of the eudialyte group, with complex formula written as Na1963Si26O74Cl·2H2O. It is unique among the eudialyte group as the only titanosilicate. The two dual-nature minerals of the group, being both titano- and zirconosilicates, are labyrinthite and dualite. They both contain alluaivite module in their structures. Alluaivite is named after Mt. Alluaiv in Lovozero Tundry massif, Kola Peninsula, Russia, where it is found in ultra-agpaitic, hyperalkaline pegmatites.Alluaivite was found in ultra-agpaitic pegmatites on Mt. Alluaiv, Lovozero massif, Kola Peninsula, Russia - hence its name. Associating minerals are aegirine, arfvedsonite, eudialyte, nepheline, potassic feldspar, and sodalite.
