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The synthesis and upper thermal stability of cancrinite were investigated experimentally in the system Na 2 O-CaO-Al 2 O 3 -SiO 2 -CO 2 -H 2 O at 2 kbar and in the presence of a mixed H 2 O-CO 2  fluid. Cancrinite could only be formed under water-rich conditions in this system. The breakdown of cancrinite to nepheline + calcite occurred at decreasing temperatures with increasing X CO₂  as expected for a dehydration reaction of the form cancrinite = nepheline + calcite + n H₂O . Partial melting and the formation of melilite was observed at the highest temperatures and for the most H 2 O-rich fluid compositions.

Experiments on the stability of cancrinite in the system Na 2 O-CaO-Al 2 O 3 -SiO 2 -CO 2 -H 2 O