CRYSTALLOCHEMICAL PECULIARITIES Of METASILICATES STRUCTURES FORMATION

Abstract

This work is represented by results of crystallochemical study concerning the role of metal cation,
parent structural minals and structural units during formation of metasilicates structures. Study of
metasilicates structure allowed to define: 1) if chemical composition meets the requirement of definite structure in this case there is no need to crystallize it in the form of other phase; 2) if there are small and large cations in composition of metasilicates in this case trade-off appears, i.e. chain consists of sorogroups and triorthogroups; 3) if different type structural units form in the same structure in this case they can form crystalline structure with mixed structural types; 4) if (OH)-group includes silicon coordination in this case by temperature increase Si-O radical complicates at first stage and further it becomes simpler; 5) there are K, Ho-triorthosilicates and Ca-hydrosilicate-afwillite in hard phase reaction in this case their derivatives remain inheritance of structural peculiarities.