Calcite-Aragonite Equilibrium

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Science  22 Mar 1963:
Vol. 139, Issue 3560, pp. 1197-1198
DOI: 10.1126/science.139.3560.1197


Calcite-aragonite equilibrium, determined with an oscillating Griggs-Kennedy squeezer over the range 100° to 575°C, is given by P = 5500500) + 12.61.5) T where pressure is in bars and temperature is in degrees Celsius. Our new determination agrees with earlier high-temperature work but is significantly different from previous low-temperature work. The equilibrium curve obtained can be used to interpret formation of aragonite during metamorphism.