Aegirine is synthesized at temperatures as low as 200°C in the system Si, Fe, Na, H 2 O. Aegirine is mixed with a poorly crystallized 2:1 ferric phyllosilicate. At lower temperature, only 2:1 phyllosilicates are synthesized. A thermodynamic approach shows that the synthesized aegirine is in equilibrium with ferripyrophyllite, and that the stability field of aegirine at lower temperature is strongly reduced by a 2:1 phyllosilicate with a tetrahedral charge due to tetrahedral substitutions of Si for Fe 3+ .
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Decarreau et al. (2004) studied this question.
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