Home Physical Sciences Cation order-disorder in Fe-bearing pyrope and grossular garnets: A 27Al and 29Si MAS NMR and 57Fe Mössbauer spectroscopy study
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Cation order-disorder in Fe-bearing pyrope and grossular garnets: A 27Al and 29Si MAS NMR and 57Fe Mössbauer spectroscopy study

  • Aaron C. Palke EMAIL logo , Jonathan F. Stebbins , Charles A. Geiger and Gerold Tippelt
Published/Copyright: April 9, 2015
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American Mineralogist
From the journal American Mineralogist Volume 100 Issue 2-3

Abstract

A suite of Fe-bearing natural and synthetic grossular-rich [(Ca,Fe)3(Al,Fe)2Si3O12] and pyrope-rich [(Mg,Fe)3Al2Si3O12] garnets were investigated using 27Al and 29Si MAS NMR and 57Fe Mössbauer spectroscopy. This was done to study the state of cation order-disorder in garnet solid solutions by analyzing paramagnetically shifted resonances in high-resolution NMR spectra. The Mössbauer spectra, along with electron microprobe results, give the concentrations of Fe2+ and Fe3+ and their site occupancies, even in grossular samples with very low concentrations of Fe. MAS NMR spectra were collected on Fe2+-bearing grossular- and pyrope-rich garnets with up to 25 mol% almandine component and on other Fe3+-bearing grossular samples with up to 9 mol% andradite component. Despite peak broadening and signal loss, structural information was even obtained from garnet with relatively high Fe contents (25 mol% almandine component). Paramagnetically shifted NMR peaks, related to the presence of Fe2+, were observed in grossular samples and are similar in nature to those reported previously for natural, relatively low-Fe2+ pyrope garnets by Stebbins and Kelsey (2009). Additional NMR peaks appear as the concentration of Fe2+ increases, reflecting an increase in the average number of neighboring Fe2+ cations around AlO6 and SiO4 groups. These newly observed peaks hold potential to provide information concerning the presence or absence of short-range ordering in certain Fe-bearing silicate garnets. The effect of Fe3+ on the MAS NMR spectra of garnet appears to be less pronounced, because it does not produce any observable paramagnetically shifted resonances.

Keywords: NMR spectroscopy; Mössbauer spectroscopy; pyrope; grossular; almandine; garnet; paramagnetic shifts; short-range order
Received: 2014-5-26
Accepted: 2014-8-31
Published Online: 2015-4-9
Published in Print: 2015-2-1

© 2015 by Walter de Gruyter Berlin/Boston

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  4. In situ observation of the pyroxene-majorite transition in Na2MgSi5O12 using synchrotron radiation and Raman spectroscopy of Na-majorite
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https://doi.org/10.2138/am-2015-5062
Keywords for this article
NMR spectroscopy; Mössbauer spectroscopy; pyrope; grossular; almandine; garnet; paramagnetic shifts; short-range order

Articles in the same Issue

  1. Anhydrite: An important sulfur binder limiting the climatic impact of subaerial volcanic eruptions
  2. Tweed, twins, and holes
  3. The chemical behavior of fluids released during deep subduction based on fluid inclusions
  4. In situ observation of the pyroxene-majorite transition in Na2MgSi5O12 using synchrotron radiation and Raman spectroscopy of Na-majorite
  5. Prevalence of growth twins among anhedral plagioclase microlites
  6. Intrinsic conditions of magma genesis at the Lunar Crater Volcanic Field (Nevada), and implications for internal plumbing and magma ascent
  7. A rock fragment related to the magnesian suite in lunar meteorite Allan Hills (ALHA) 81005
  8. Trinitite redux: Mineralogy and petrology
  9. Pauloabibite, trigonal NaNbO3, isostructural with ilmenite, from the Jacupiranga carbonatite, Cajati, São Paulo, Brazil
  10. Kojonenite, a new palladium tin telluride mineral from the Stillwater Layered Igneous Intrusion, Montana, U.S.A.
  11. Cathodoluminescence dependence on feldspar mineral structure and implications for forensic geology
  12. Non-invasive assessment of the formation of tourmaline nodules by X-ray microtomography and computer modeling
  13. Alkali influence on the water speciation and the environment of protons in silicate glasses revealed by 1H MAS NMR spectroscopy
  14. Carbonate mineralization in percolated olivine aggregates: Linking effects of crystallographic orientation and fluid flow
  15. The catalytic effect of bound extracellular polymeric substances excreted by anaerobic microorganisms on Ca-Mg carbonate precipitation: Implications for the “dolomite problem”
  16. Experimental study along the magnesio-hornblende–glaucophane join
  17. Direct observation of Ca-Na ordering and structure polarity in Ca-rich intermediate plagioclase feldspar with incommensurate modulated structure
  18. Stability and adhesion of calcite/montmorillonite assembly
  19. Experimental and modeled chlorine solubilities in aluminosilicate melts at 1 to 7000 bars and 700 to 1250 °C: Applications to magmas of Augustine Volcano, Alaska
  20. Cation order-disorder in Fe-bearing pyrope and grossular garnets: A 27Al and 29Si MAS NMR and 57Fe Mössbauer spectroscopy study
  21. Trace and minor elements in galena: A reconnaissance LA-ICP-MS study
  22. A refined monoclinic structure for a variety of “hydrohematite”
  23. Mössbauer spectroscopic study of natural eosphorite, [(Mn,Fe)AlPO4(OH)2H2O]
  24. P-V-T equation of state of Ca3Cr2Si3O12 uvarovite garnet by using a diamond-anvil cell and in-situ synchrotron X-ray diffraction
  25. Possible new Ca-REE-Bi phosphate minerals from a tungsten-rich calcsilicate skarn, Sierra Nevada Mountains, California
  26. Klebelsbergite, Sb4O4SO4(OH)2: Stability relationships, formation in Nature, and refinement of its structure
  27. Balestraite, KLi2VSi4O10O2, the first member of the mica group with octahedral V5+
  28. Prediction of enthalpies of formation of hydrous sulfates
  29. Complete substitution of Fe2+ by Mg in Fe4O5: The crystal structure of the Mg2Fe2O5 end-member
  30. The effect of H2O on F and Cl solubility and solution mechanisms of in aluminosilicate melts at high pressure and high temperature
  31. The elasticity of MgAl2O4–MnAl2O4 spinels by Brillouin scattering and an empirical approach for bulk modulus prediction
  32. Synthesis of stoichiometric nickel aluminate spinel nanoparticles
  33. New Mineral Names
  34. Book Review
  35. American Mineralogist thanks the year 2014 reviewers
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