Microporous titanosilicates of the lintisite-kukisvumite group and their transformation in acidic solutions

Abstract

Alkaline massifs of the Kola Peninsula are the well-known sources of new minerals that became the prototypes of new advanced materials owing to variety of their unique technological properties. Such minerals as zorite, sitinakite, minerals of ivanyukite group, etc. demonstrate extremely high ability to cation exchange in combination with stability in a wide range of conditions. Other microporous titanosilicates, e.g. minerals of the labuntsovite group do not have such properties, however, in some cases the restrictions can be lifted by subtle modifications of their structures and/or chemical composition. As a rule, these minerals are metastable compounds: relatively small chemical and/or structural fluctuations induce significant changes of their physical properties as well as their cation-exchange capabilities. Such sensitivity to fine compositional and structural changes is characteristic for minerals of the lintisite-kukisvumite group structurally related to vinogradovite.