On the entropy of glaucophane Na2Mg3Al2Si8O22(OH)2
Contributions to Mineralogy and Petrology
By: R. A. Robie, B. S. Hemingway, P. Gillet, and B. Reynard
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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 Cp0data to values for ideal glaucophane, Na2Mg3Al2Si8O22(OH)2 the third-law entropy S2980-S00was calculated to be 541.2??3.0 J??mol-1??K-1. Our value for S2980-S00is 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. ?? 1991 Springer-Verlag.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | On the entropy of glaucophane Na2Mg3Al2Si8O22(OH)2 |
| Series title | Contributions to Mineralogy and Petrology |
| DOI | 10.1007/BF00310682 |
| Volume | 107 |
| Issue | 4 |
| Year Published | 1991 |
| Language | English |
| Publisher location | Springer-Verlag |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Contributions to Mineralogy and Petrology |
| First page | 484 |
| Last page | 486 |
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