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The crystal chemistry of julgoldite-Fe3+ from Bombay, India, studied using synchrotron X-ray powder diffraction and 57Fe Mössbauer spectroscopy

  • G. Artioli EMAIL logo , C.A. Geiger and M. Dapiaggi
Published/Copyright: March 31, 2015
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American Mineralogist
From the journal American Mineralogist Volume 88 Issue 7

Abstract

The crystal structure of julgoldite-Fe3+ from Bombay, India, was investigated by 57Fe Mössbauer spectroscopy and synchrotron X-ray powder diffraction. Only ferric iron was detected in the Mössbauer measurements and it occurs at two different octahedral sites in the atomic ratio 20:80. Based on Rietveld refinements, the Fe3+ cations are located at the X- and Y-octahedral sites with atomic percentages of about 25% and 75%, respectively. The resulting chemical formula of the Bombay julgoldite sample is Ca8(Fe3+2.7Al1.1Mg0.2)(Fe3+8.0)Si12O42(OH)14. The oxidation state of Fe is not the same as that arrived at through simple crystal-chemical considerations. Such analysis cannot give quantitative results for the valence state of mixed-valence cations in pumpellyite-type minerals and their intracrystalline partitioning behavior. Assignments of the Mössbauer absorption doublets and an analysis of Fe-intracrystalline partitioning behavior are discussed with reference to previous works on different pumpellyite-type minerals.

Received: 2002-9-17
Accepted: 2003-2-3
Published Online: 2015-3-31
Published in Print: 2003-7-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Bonding preferences of non-bridging O atoms: Evidence from 17O MAS and 3QMAS NMR on calcium aluminate and low-silica Ca-aluminosilicate glasses
  2. BNa–BLi solid-solution in A-site-vacant amphiboles: synthesis and cation ordering along the ferri-clinoferroholmquistite–riebeckite join
  3. A new uranyl carbonate sheet in the crystal structure of fontanite, Ca[(UO2)3(CO3)2O2](H2O)6
  4. XANES calibrations for the oxidation state of iron in a silicate glass
  5. Dissolution of strontianite at high P-T conditions: An in-situ synchrotron X-ray fluorescence study
  6. Intergrown niobian rutile phases with Sc- and W-rich ferrocolumbite: An electron-microprobe and Rietveld study
  7. Bulk moduli and high-pressure crystal structures of minium, Pb3O4, determined by X-ray powder diffraction
  8. Slow oxygen diffusion rates in igneous zircons from metamorphic rocks
  9. Chemistry of grain boundaries in mantle rocks
  10. Heats of mixing of silicate liquid in the systems diopside-anorthite-akermanite, diopside-anorthite-forsterite, and diopside-silica
  11. High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes
  12. Monte Carlo simulations of ordering of Al, Fe, and Mg cations in the octahedral sheet of smectites and illites
  13. Influence of F content on the composition of Al-rich synthetic phlogopite: Part II. Probing the structural arrangement of aluminum in tetrahedral and octahedral layers by 27Al MQMAS and 1H/19F-27Al HETCOR and REDOR experiments
  14. Dawsonite: An inclusion mineral in quartz from the Tin Mountain pegmatite, Black Hills, South Dakota
  15. Hydrogen-bonded water in laumontite II: Experimental determination of site-specific thermodynamic properties of hydration of the W1 and W5 sites
  16. High P-T phase relations and stability of a (21)-hydrous clinopyribole in the system K2ONa2O- CaO-MgO-Al2O3-SiO2-H2O: An experimental study to 18 GPa
  17. The crystal chemistry of julgoldite-Fe3+ from Bombay, India, studied using synchrotron X-ray powder diffraction and 57Fe Mössbauer spectroscopy
  18. Partitioning of Sr, Ba, Rb, Y, and LREE between plagioclase and peraluminous silicic magma
  19. Infrared and TEM characterization of amphiboles synthesized near the tremolite-pargasite join in the ternary system tremolite-pargasite-cummingtonite
  20. Coupling between non-convergent ordering and transition temperature in the C2/c ↔ P21/c phase transition in pigeonite
  21. 57Fe Mössbauer-effect studies of Ca-rich, Fe-bearing clinopyroxenes: Part I. Paramagnetic spectra of magnesian hedenbergite
  22. 57Fe Mössbauer-effect studies of Ca-rich, Fe-bearing clinopyroxenes: Part II. Magnetic spectra of magnesian hedenbergite
  23. 57Fe Mössbauer-effect studies of Ca-rich, Fe-bearing clinopyroxenes: Part III. Diopside
  24. Letters. Aluminum substitution in MgSiO3 perovskite: Investigation of multiple mechanisms by 27Al NMR
  25. Studtite, [(UO2)(O2)(H2O)2](H2O)2: The first structure of a peroxide mineral
  26. Nanometer-scale measurements of iron oxidation states of cronstedtite from primitive meteorites
https://doi.org/10.2138/am-2003-0717

Articles in the same Issue

  1. Bonding preferences of non-bridging O atoms: Evidence from 17O MAS and 3QMAS NMR on calcium aluminate and low-silica Ca-aluminosilicate glasses
  2. BNa–BLi solid-solution in A-site-vacant amphiboles: synthesis and cation ordering along the ferri-clinoferroholmquistite–riebeckite join
  3. A new uranyl carbonate sheet in the crystal structure of fontanite, Ca[(UO2)3(CO3)2O2](H2O)6
  4. XANES calibrations for the oxidation state of iron in a silicate glass
  5. Dissolution of strontianite at high P-T conditions: An in-situ synchrotron X-ray fluorescence study
  6. Intergrown niobian rutile phases with Sc- and W-rich ferrocolumbite: An electron-microprobe and Rietveld study
  7. Bulk moduli and high-pressure crystal structures of minium, Pb3O4, determined by X-ray powder diffraction
  8. Slow oxygen diffusion rates in igneous zircons from metamorphic rocks
  9. Chemistry of grain boundaries in mantle rocks
  10. Heats of mixing of silicate liquid in the systems diopside-anorthite-akermanite, diopside-anorthite-forsterite, and diopside-silica
  11. High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes
  12. Monte Carlo simulations of ordering of Al, Fe, and Mg cations in the octahedral sheet of smectites and illites
  13. Influence of F content on the composition of Al-rich synthetic phlogopite: Part II. Probing the structural arrangement of aluminum in tetrahedral and octahedral layers by 27Al MQMAS and 1H/19F-27Al HETCOR and REDOR experiments
  14. Dawsonite: An inclusion mineral in quartz from the Tin Mountain pegmatite, Black Hills, South Dakota
  15. Hydrogen-bonded water in laumontite II: Experimental determination of site-specific thermodynamic properties of hydration of the W1 and W5 sites
  16. High P-T phase relations and stability of a (21)-hydrous clinopyribole in the system K2ONa2O- CaO-MgO-Al2O3-SiO2-H2O: An experimental study to 18 GPa
  17. The crystal chemistry of julgoldite-Fe3+ from Bombay, India, studied using synchrotron X-ray powder diffraction and 57Fe Mössbauer spectroscopy
  18. Partitioning of Sr, Ba, Rb, Y, and LREE between plagioclase and peraluminous silicic magma
  19. Infrared and TEM characterization of amphiboles synthesized near the tremolite-pargasite join in the ternary system tremolite-pargasite-cummingtonite
  20. Coupling between non-convergent ordering and transition temperature in the C2/c ↔ P21/c phase transition in pigeonite
  21. 57Fe Mössbauer-effect studies of Ca-rich, Fe-bearing clinopyroxenes: Part I. Paramagnetic spectra of magnesian hedenbergite
  22. 57Fe Mössbauer-effect studies of Ca-rich, Fe-bearing clinopyroxenes: Part II. Magnetic spectra of magnesian hedenbergite
  23. 57Fe Mössbauer-effect studies of Ca-rich, Fe-bearing clinopyroxenes: Part III. Diopside
  24. Letters. Aluminum substitution in MgSiO3 perovskite: Investigation of multiple mechanisms by 27Al NMR
  25. Studtite, [(UO2)(O2)(H2O)2](H2O)2: The first structure of a peroxide mineral
  26. Nanometer-scale measurements of iron oxidation states of cronstedtite from primitive meteorites
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