Contribution
Hydrothermal synthesis of aegirine at 200C
Decarreau, Alain; Petit, Sabine; Vieillard, Philippe; Dabert, Nathalie
European Journal of Mineralogy Volume 16 Number 1 (2004), p. 85 - 90
publié: Feb 23, 2004
Abstract
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+.
Mots-clefs
aegirine • synthesis • low-temperature • thermodynamic