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The phase relations in the Na 2 CO 3 -(Fe 0.87 Mn 0.06 Mg 0.07 )CO 3  system have been studied in Kawai-type multi-anvil experiments using graphite capsules at 6.0 GPa and 900-1400 °C. Subsolidus assemblages comprise the stability fields of Na 2 CO 3  + Na 2 Fe(CO 3 )2 and Na 2 Fe(CO 3 ) 2  + siderite with the transition boundary at X(Na 2 CO 3 ) = 50 mol%. Intermediate Na 2 Fe(CO 3 ) 2  compound has rhombohedral R3̅ eitelite structure with cell parameters a = 4.9712(16), c = 16.569(4) Å, V = 354.61(22). The Na 2 CO 3-  Na 2 Fe(CO 3 ) 2  eutectic is established at 1000 °C and 66 mol% Na 2 CO 3 . Na 2 Fe(CO 3 ) 2  disappears between 1000 and 1100 °C via incongruent melting to siderite and a liquid containing about 55 mol% Na 2 CO 3 . Siderite remains a subliquidus phase at 1400 °C at X(Na 2 CO 3 ) ≤ 30 mol%.

The system Na 2 CO 3 -FeCO 3 at 6 GPa and its relation to the system Na 2 CO 3 -FeCO 3 -MgCO 3