Scapolite was synthesized from a calcite-bearing nepheline syenite in the presence of H2O-rich and CO2-rich aqueous vapor phases in the melting interval at pressures between 3 and 6 kbar. Electronmicroprobe analysis of a scapolite formed at about 6 kbar and 900°C in the presence of a CO2-rich aqueous vapor phase gives a structural formula of NaCa3Al5Si7O24(CO3)(CO3 assigned arbitrarily). This formula is equivalent to 3 plagioclase (An67) + 1 calcite.

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First page of Synthesis of Scapolite under Magmatic Conditions
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