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Hydrothermal synthesis of aegirine at 200°C

UMR CNRS 6532 HYDRASA, Université de Poitiers, 40 avenue du Recteur Pineau, F-86022 Poitiers Cedex, France

^* E-mail: alain.decarreau{at}hydrasa.univ-poitiers.fr

Aegirine is synthesized at temperatures as low as 200°C in the system Si, Fe, Na, H₂O. 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 Fe³⁺.

Key-words: aegirine, synthesis, low-temperature, thermodynamic.

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