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X-ray absorption characterization of Cr in forsterite within the MacAlpine Hills 88136 EL3 chondritic meteorite

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Published/Copyright: January 15, 2014
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American Mineralogist
From the journal American Mineralogist Volume 99 Issue 1

Abstract

Chromium K-edge X-ray absorption spectra were collected to characterize Cr in forsterite (Mg2SiO4) as well as sulfides within the MAC 88136 EL3 chondrite to determine Cr valence and to see whether forsterite within this meteorite can be used as a Cr2+-silicate standard. Spectra were measured on several areas within a nearly pure 100 × 200 μm forsterite grain containing 0.13 wt% Cr. XANES findings indicate highly reduced Cr2+ species, with no clear evidence of Cr3+ or Cr6+. EXAFS data indicate an average 2.02 Å Cr-O nearest-neighbor distance, consistent with Cr-O distances found in square-planar Cr2+O4 sites observed in synthetic crystalline silicates, and an average 2.69 Å Cr-Si second-nearest neighbor distance, consistent with Cr2+ substituting for Mg2+ in the forsterite M(1) site. Nearest-neighbor Debye-Waller factor and coordination number parameters indicate Cr2+ is likely entering forsterite in disordered sites that are possible intermediates between M(1) and squareplanar Cr2+O4 configurations. Preliminary Cr XAS measurements on sulfides within this meteorite also indicate Cr2+ in CrS6 octahedra.

Keywords : Cr2+-silicate; meteorite; X-ray absorption spectroscopy
Published Online: 2014-01-15
Published in Print: 2014-01-01

© 2014 by Walter de Gruyter GmbH & Co.

Articles in the same Issue

  1. Shedding light on bone material
  2. Weddellite from renal stones: Structure refinement and dependence of crystal chemical features on H2O content
  3. Erionite and offretite from the Killdeer Mountains, Dunn County, North Dakota, U.S.A.
  4. Molecular water in nominally unhydrated carbonated hydroxylapatite: The key to a better understanding of bone mineral
  5. Precipitation and dissolution of chromite by hydrothermal solutions in the Oman ophiolite: New behavior of Cr and chromite
  6. Phase transitions and equation of state of forsterite to 90 GPa from single-crystal X-ray diffraction and molecular modeling
  7. Weathering of cobalt arsenides: Natural assemblages and calculated stability relations among secondary Ca-Mg-Co arsenates and carbonates
  8. Alburnite, Ag8GeTe2S4, a new mineral species from the Roşia Montana Au-Ag epithermal deposit, Apuseni Mountains, Romania
  9. Cathodoluminescence of alkali feldspars and radiation effects on the luminescent properties
  10. Thermochemistry of the alkali feldspars: Calorimetric study of the entropy relations in the low albite–low microcline series
  11. Thermal equation of state and spin transition of magnesiosiderite at high pressure and temperature
  12. Thermal diffusivities of MgSiO3 and Al-bearing MgSiO3 perovskites
  13. The sound velocity measurements of Fe3S
  14. PDF analysis of ferrihydrite: Critical assessment of the under-constrained akdalaite model
  15. Aluminum ion occupancy in the structure of synthetic saponites: Effect on crystallinity
  16. DFT investigation of structural and vibrational properties of type B and mixed A-B carbonated hydroxylapatite
  17. Chlorite topography and dissolution of the interlayer studied with atomic force microscopy
  18. The effect of XPS background removing method on the appraisal of Ti and Fe: The case of phlogopites and brookite
  19. Measurement of water contents in olivine using Raman spectroscopy
  20. Perbøeite-(Ce) and alnaperbøeite-(Ce), two new members of the epidote-törnebohmite polysomatic series: Chemistry, structure, dehydrogenation, and clue for a sodian epidote end-member
  21. Crystal structure and compressibility of lead dioxide up to 140 GPa
  22. A comparative analysis of the mechanical behavior of carbon dioxide and methane hydrate-bearing sediments
  23. Crystal structures and stabilities of cristobalite-helium phases at high pressures
  24. X-ray absorption characterization of Cr in forsterite within the MacAlpine Hills 88136 EL3 chondritic meteorite
  25. Monipite, MoNiP, a new phosphide mineral in a Ca-Al-rich inclusion from the Allende meteorite
  26. Compositional zoning in dolomite from lawsonite-bearing eclogite (SW Tianshan, China): Evidence for prograde metamorphism during subduction of oceanic crust
  27. Vanadio-oxy-dravite, NaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup
  28. XAS evidence for Ni sequestration by siderite in a lateritic Ni-deposit from New Caledonia
  29. Vladykinite, Na3Sr4(Fe2+Fe3+)Si8O24: A new complex sheet silicate from peralkaline rocks of the Murun complex, eastern Siberia, Russia
  30. New Mineral Names
  31. Memorial of James Burleigh Thompson, Jr., 1921–2011
  32. Book review: MANTLE CONVECTION FOR GEOLOGISTS by Geoffrey F. Davies
  33. Errata
https://doi.org/10.2138/am.2014.4508
Keywords for this article
Cr2+-silicate; meteorite; X-ray absorption spectroscopy

Articles in the same Issue

  1. Shedding light on bone material
  2. Weddellite from renal stones: Structure refinement and dependence of crystal chemical features on H2O content
  3. Erionite and offretite from the Killdeer Mountains, Dunn County, North Dakota, U.S.A.
  4. Molecular water in nominally unhydrated carbonated hydroxylapatite: The key to a better understanding of bone mineral
  5. Precipitation and dissolution of chromite by hydrothermal solutions in the Oman ophiolite: New behavior of Cr and chromite
  6. Phase transitions and equation of state of forsterite to 90 GPa from single-crystal X-ray diffraction and molecular modeling
  7. Weathering of cobalt arsenides: Natural assemblages and calculated stability relations among secondary Ca-Mg-Co arsenates and carbonates
  8. Alburnite, Ag8GeTe2S4, a new mineral species from the Roşia Montana Au-Ag epithermal deposit, Apuseni Mountains, Romania
  9. Cathodoluminescence of alkali feldspars and radiation effects on the luminescent properties
  10. Thermochemistry of the alkali feldspars: Calorimetric study of the entropy relations in the low albite–low microcline series
  11. Thermal equation of state and spin transition of magnesiosiderite at high pressure and temperature
  12. Thermal diffusivities of MgSiO3 and Al-bearing MgSiO3 perovskites
  13. The sound velocity measurements of Fe3S
  14. PDF analysis of ferrihydrite: Critical assessment of the under-constrained akdalaite model
  15. Aluminum ion occupancy in the structure of synthetic saponites: Effect on crystallinity
  16. DFT investigation of structural and vibrational properties of type B and mixed A-B carbonated hydroxylapatite
  17. Chlorite topography and dissolution of the interlayer studied with atomic force microscopy
  18. The effect of XPS background removing method on the appraisal of Ti and Fe: The case of phlogopites and brookite
  19. Measurement of water contents in olivine using Raman spectroscopy
  20. Perbøeite-(Ce) and alnaperbøeite-(Ce), two new members of the epidote-törnebohmite polysomatic series: Chemistry, structure, dehydrogenation, and clue for a sodian epidote end-member
  21. Crystal structure and compressibility of lead dioxide up to 140 GPa
  22. A comparative analysis of the mechanical behavior of carbon dioxide and methane hydrate-bearing sediments
  23. Crystal structures and stabilities of cristobalite-helium phases at high pressures
  24. X-ray absorption characterization of Cr in forsterite within the MacAlpine Hills 88136 EL3 chondritic meteorite
  25. Monipite, MoNiP, a new phosphide mineral in a Ca-Al-rich inclusion from the Allende meteorite
  26. Compositional zoning in dolomite from lawsonite-bearing eclogite (SW Tianshan, China): Evidence for prograde metamorphism during subduction of oceanic crust
  27. Vanadio-oxy-dravite, NaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup
  28. XAS evidence for Ni sequestration by siderite in a lateritic Ni-deposit from New Caledonia
  29. Vladykinite, Na3Sr4(Fe2+Fe3+)Si8O24: A new complex sheet silicate from peralkaline rocks of the Murun complex, eastern Siberia, Russia
  30. New Mineral Names
  31. Memorial of James Burleigh Thompson, Jr., 1921–2011
  32. Book review: MANTLE CONVECTION FOR GEOLOGISTS by Geoffrey F. Davies
  33. Errata
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