Microporous crystalline compounds have attracted considerable attention because of their applications in various areas of technology, including catalysis, radioactive waste management, gas separation, adsorption, ion-exchange, etc. Until recently, the major part of research in this field was focused on zeolites and related materials based upon open three-dimensional (3D) frameworks of linked tetrahedra. However, within the last 10–15 years, the quest for new microporous materials led researchers to explore other possibilities, e.g., framework materials containing non-tetrahedral cations that play a crucial role in a framework construction. As for zeolites, this research direction renewed interest in mineral phases as materials formed in...

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