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The reaction 8En + Di + [1/2K2O + 1/2Na2O + H2O] = KRich + 2Fo determines the formation of K-richterite, an important mineral indicator of the highest degree of metasomatism of upper mantle peridotites. This reaction was studied experimentally the presence of a K2CO3-Na2CO3- CO2-H2O fluid a temperature of 1000°C and a pressure of 3 GPa.