The chapter deals with relations between genesis and crystal-chemical aspects of microporous heterosilicate minerals (MHM) with mixed octahedral-tetrahedral frameworks and containing 6 or 5 coordinated transition elements (mainly Ti, Nb, Zr, Fe, Mn, Zn) which have been reviewed and discussed by Chukanov and Pekov (2005).

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Natural occurrences of microporous silicates with transition elements are very localized: 113 out 122 known MHM (Chukanov and Pekov 2005, Tables 22–4) occur in postmagmatic derivatives of peralkaline rocks. Most of them are known only in this geological setting together with zeolites and zeolite-like beryllo- and borosilicates. In alkaline pegmatites...

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