Abstract
The heat capacity of glaucophane from the Sesia-Lanza region of Italy having the approximate composition (Na1.93Ca0.05Fe0.02) (Mg2.60Fe0.41) (Al1.83Fe0.15Cr0.01) (Si7.92Al0.08)O22(OH)2 was measured by adiabatic calorimetry between 4.6 and 359.4 K. After correcting the C 0p data to values for ideal glaucophane, Na2Mg3Al2Si8O22(OH)2 the third-law entropy S 0298 -S 00 was calculated to be 541.2±3.0 J·mol-1·K-1. Our value for S 0298 -S 00 is 12.0 J·mol-1·K-1 (2.2%) smaller than the value of Likhoydov et al. (1982), 553.2±3.0, is within 6.2 J·mol-1·K-1 of the value estimated by Holland (1988), and agrees remarkably well with the value calculated by Gillet et al. (1989) from spectroscopic data, 539 J·mol-1·K-1.
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Robie, R.A., Hemingway, B.S., Gillet, P. et al. On the entropy of glaucophane Na2Mg3Al2Si8O22(OH)2 . Contr. Mineral. and Petrol. 107, 484–486 (1991). https://doi.org/10.1007/BF00310682
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DOI: https://doi.org/10.1007/BF00310682