Synthesis of Phengites and Illites

There are, among the potassic micas one main series of 

This solid solution diminishes with pressure. Thus this substitution should 

If we consider the solid solution in the mica compositions between 3+ 

Natural mica compositions of the dioctahedral, potassic types have been discussed by Velde (1965b) in connection with the solid solution between muscovite and the different celadonite mica molecules. It was shown that both natural and synthetic micas formed two distinct compositional and genetic groups. The important point made in the discussion is the definition of the term mica. The most restrictive criteria as was mentioned before is the necessity for the mineral in question to have a net charge (the sum of octahedral and tetrahedral electrostatic 

ML = Mixed layered mica-montmorillonite F = feldspar Q = quartz Bio = biotite Mo montmorillonite. 

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