Systems of silicate melts

Let us consider what happens with the structure when adding another oxide (e.g. MeO) to Si02. The situation can be expressed by the scheme 

In the silicate chemistry, the oxides are divided into three principal groups  

Another characteristic feature of the silicate melts is the formation of two immiscible liquids in the region of high concentration of Si02. Such a behavior is observed, for example, in the systems of alkali metal silicates and earth alkali metal silicates. 

The chemistry of silicate melts is rather complicated and special monographs devoted to this problem can be found in the literature. Therefore, only the main characterization is presented here. 

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