What is "dualite"

Dualite is a very rare and complex mineral of the eudialyte group, its complexity being expressed in its formula: Na(Ca,Na,Ce,Sr)(Na,Mn,Fe,Ti)ZrTiMnSiO(OH,HO,Cl). The formula is simplified as it does not show the presence of cyclic silicate groups. The name of the mineral comes from its dual nature: zircono- and titanosilicate at once. Dualite has two modules in its structure: alluaivite one and eudialyte one. After alluaivite and labyrinthite it stands for third representative of the eudialyte group with essential titanium.