Abstract
Hydrothermal melting reactions in the system NaAlSiO4-SiO2-H2O have been extended into the coesite stability field using piston-cylinder apparatus, and the quartz-coesite transition has been bracketed at 735° (28.0±0.9 Kb) and at 800° C (28.15±0.9 Kb) in the presence of a silicate liquid phase; this provided favorable kinetic conditions. The results agree closely with previous piston-cylinder determinations employing a correction for pressure loss due to friction. Consideration of previous calibration and hysteresis experiments leads to the conclusion that despite its potential utility, the quartz-coesite transition can not be confidently used as a calibrant for piston-cylinder apparatus until the question of whether or not to apply a friction correction has been resolved.
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Boettcher, A.L., Wyllie, P.J. The quartz-coesite transition measured in the presence of a silicate liquid and calibration of piston-cylinder apparatus. Contr. Mineral. and Petrol. 17, 224–232 (1968). https://doi.org/10.1007/BF00388945
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DOI: https://doi.org/10.1007/BF00388945