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Thermodynamic properties of natural melilites

  • Lyubov P. Ogorodova EMAIL logo , Yuliya D. Gritsenko , Marina F. Vigasina , Andrey Y. Bychkov , Dmitry A. Ksenofontov and Lyubov V. Melchakova
Published/Copyright: November 28, 2018
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American Mineralogist
From the journal American Mineralogist Volume 103 Issue 12

Abstract

In the present study, four samples of natural melilites were characterized using electron microprobe analysis, powder X‑ray diffraction, FTIR, and Raman spectroscopy, and their thermodynamic properties were measured with a high-temperature heat-flux Tian-Calvet microcalorimeter. The enthalpies of formation from the elements were determined to be: –3796.3 ± 4.1 kJ/mol for Ca1.8Na0.2(Mg0.7Al0.2Fe20.1+ )Si2O7, –3753.6 ± 5.2 kJ/mol for Ca1.6Na0.4(Mg0.5Al0.4Fe20.1+ )Si2O7, –3736.4 ± 3.7 kJ/mol for Ca1.6Na0.4(Mg0.4Al0.4Fe20.2+ )Si2O7, and –3929.2 ± 3.8 kJ/mol for Ca2(Mg0.4Al0.6)[Si1.4Al0.6O7]. Using the obtained formation enthalpies and estimated entropies, the standard Gibbs free energies of formation of these melilites were calculated. Finally, the enthalpies of the formation of the end-members of the isomorphic åkermanite–gehlenite and åkermanite–alumoåkermanite series were derived. The obtained thermodynamic properties of melilites of different compositions can be used for quantitative modeling of formation conditions of these minerals in related geological and industrial processes.

Keywords: Melilite; åkermanite; gehlenite; alumoåkermanite; thermochemistry; enthalpy of formation; entropy; Gibbs free energy; Calvet microcalorimetry

Acknolwlegements

We are very grateful to Hongwu Xu and the reviewers for their helpful notes and comments, as well as to the Fersman Mineralogical Museum RAS for providing samples of melilites. This work was supported by Russian Foundation for Basic Research (grant 18-29-12128 mk).

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Received: 2018-01-18
Accepted: 2018-08-01
Published Online: 2018-11-28
Published in Print: 2018-12-19

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.2138/am-2018-6475
Keywords for this article
Melilite; åkermanite; gehlenite; alumoåkermanite; thermochemistry; enthalpy of formation; entropy; Gibbs free energy; Calvet microcalorimetry

Articles in the same Issue

  1. Letter
  2. Rapid solid-state sintering in volcanic systems
  3. How geometry and anisotropy affect residual strain in host-inclusion systems: Coupling experimental and numerical approaches
  4. Special collection: Earth analogs for martian geological materials and processes
  5. Diverse mineral assemblages of acidic alteration in the Rio Tinto area (southwest Spain): Implications for Mars
  6. Special collection: From magmas to ore deposits
  7. Archaean hydrothermal fluid modified zircons at Sunrise Dam and Kanowna Belle gold deposits, Western Australia: Implications for post-magmatic fluid activity and ore genesis
  8. Special collection: Water in nominally hydrous and anhydrous minerals
  9. New high-pressure phases in MOOH (M = Al, Ga, In)
  10. Articles
  11. Nuwaite (Ni6GeS2) and butianite (Ni6SnS2), two new minerals from the Allende meteorite: Alteration products in the early solar system
  12. The role of magma mixing, identification of mafic magma inputs, and structure of the underlying magmatic system at Mount St. Helens
  13. Thermodynamic properties of natural melilites
  14. Thermal conductivity anomaly in spin-crossover ferropericlase under lower mantle conditions and implications for heat flow across the core-mantle boundary
  15. Electronic properties and compressional behavior of Fe–Si alloys at high pressure
  16. Diffusion of molybdenum and tungsten in anhydrous and hydrous granitic melts
  17. High-pressure single-crystal structural analysis of AlSiO3OH phase egg
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  19. Raman modes of carbonate minerals as pressure and temperature gauges up to 6 GPa and 500 °C
  20. Crystallization conditions of micas in oxidized igneous systems
  21. The role of crustal melting in the formation of rhyolites: Constraints from SIMS oxygen isotope data (Chon Aike Province, Patagonia, Argentina)
  22. New Mineral Names
  23. Book Review
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