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Boron K-edge XANES of borate and borosilicate minerals

  • Michael E. Fleet EMAIL logo and Swaminathan Muthupari
Published/Copyright: March 26, 2015
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American Mineralogist
From the journal American Mineralogist Volume 85 Issue 7-8

Abstract

Synchrotron radiation B K-edge XANES spectra are reported for 19 borate and borosilicate minerals. The spectra are characterized by three prominent features; a sharp peak (A) at ~194 eV (the edge feature of trigonal B; IIIB), a broader peak (B) at 197-199 eV (the edge feature of tetrahedral B, IVB), and a broad peak (C) at 200-201 eV for tetrahedral B and 203-204 eV for trigonal B. The area of peak A is very sensitive to content of IIIB and its position yields information on B-O bond length and linkage of the BO3 group. The area of peak B is proportional to content of IVB but quantification is limited by overlap with peak C. The width of peak B increases with increasing divergence of B-O bond lengths, responding to splitting of σ*(t2) antibonding orbitals. The tetrahedral component of peak C appears to be a s-shape resonance. For trigonal B minerals, the relative intensity of peak C and its satellite peaks increases with increase in mean size and/or atomic number of next-nearestneighbor cations, C being most intense in vonsenite (Fe2Fe3+BO5). Priceite (Ca4B10O19·7H2O), of unknown structure, has 80% IVB, and an isolated BX3 group with IIIB-O = 1.373(5) Å. Comparison of B K-edge XANES spectra collected using total electron yield (sampling depth <60 Å) and fluorescence yield (sampling depth <1100 Å) shows that borates and borosilicates readily reconstruct in surface and near-surface environments. More profound structural damage involving conversion of IVB to IIIB occurs in minerals with high contents of IVB, and hydrous Mg borates with interstitial H2O are unstable in the high vacuum of the spectrometer.

Received: 1999-4-2
Accepted: 2000-2-14
Published Online: 2015-3-26
Published in Print: 2000-7-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Application of new experimental and garnet Margules data to the garnet-biotite geothermometer
  2. Volumes of mixing in aluminosilicate garnets: Solid solution and strain behavior
  3. Cerium anomaly and Th/U fractionation in the 1.85 Ga Flin Flon Paleosol: Clues from REE- and U-rich accessory minerals and implications for paleoatmospheric reconstruction
  4. Os solubility in silicate melts: New efforts and results
  5. Enstatite-forsterite-water equilibria at elevated temperatures and pressures
  6. The OH-F substitution in synthetic pargasite at 1.5 kbar, 850 °C
  7. Uptake of aqueous Pb by Cl-, F–, and OH– apatites: Mineralogic evidence for nucleation mechanisms
  8. Temperature dependence of the hyperfine parameters of synthetic P21/c Mg-Fe clinopyroxenes along the MgSiO3-FeSiO3 join
  9. Single-crystal thermometric calibration of Fe-Mg order-disorder in pigeonites
  10. TEM observations on the P1̄ -I1̄ phase transition in feldspars along the join CaAl2Si2O8-SrAl2Si2O8
  11. Phase transitions induced by solid solution in stuffed derivatives of quartz: A powder synchrotron XRD study of the LiAlSiO4-SiO2 join
  12. The transformation of andalusite to mullite and silica: Part I. Transformation mechanism in [001]A direction
  13. The transformation of andalusite to mullite and silica: Part II. Transformation mechanisms in [100]A and [010]A directions
  14. Structure and twinning of tetragonal Ca3Mn2Ge3O12 garnet
  15. The equation of state of lawsonite to 7 GPa and 873 K, and calculation of its high pressure stability
  16. Boron K-edge XANES of borate and borosilicate minerals
  17. 113Cd double-resonance NMR as a probe of clay mineral cation exchange sites
  18. Solid state NMR study of oxygen site exchange and Al-O-Al site concentration in analcime
  19. Isomorphous substitution effect on the vibration frequencies of hydroxyl groups in molecular cluster models of the clay octahedral sheet
  20. Molecular modeling of the structure and dynamics of the interlayer and surface species of mixed-metal layered hydroxides: Chloride and water in hydrocalumite (Friedel’s salt)
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  22. Rietveld analysis of dicalcium aluminate (Ca2Al2O5) – A new high pressure phase with the Brownmillerite-type structure
  23. Suredaite, PbSnS3, a new mineral species, from the Pirquitas Ag-Sn deposit, NW-Argentina: mineralogy and crystal structure
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https://doi.org/10.2138/am-2000-0716

Articles in the same Issue

  1. Application of new experimental and garnet Margules data to the garnet-biotite geothermometer
  2. Volumes of mixing in aluminosilicate garnets: Solid solution and strain behavior
  3. Cerium anomaly and Th/U fractionation in the 1.85 Ga Flin Flon Paleosol: Clues from REE- and U-rich accessory minerals and implications for paleoatmospheric reconstruction
  4. Os solubility in silicate melts: New efforts and results
  5. Enstatite-forsterite-water equilibria at elevated temperatures and pressures
  6. The OH-F substitution in synthetic pargasite at 1.5 kbar, 850 °C
  7. Uptake of aqueous Pb by Cl-, F–, and OH– apatites: Mineralogic evidence for nucleation mechanisms
  8. Temperature dependence of the hyperfine parameters of synthetic P21/c Mg-Fe clinopyroxenes along the MgSiO3-FeSiO3 join
  9. Single-crystal thermometric calibration of Fe-Mg order-disorder in pigeonites
  10. TEM observations on the P1̄ -I1̄ phase transition in feldspars along the join CaAl2Si2O8-SrAl2Si2O8
  11. Phase transitions induced by solid solution in stuffed derivatives of quartz: A powder synchrotron XRD study of the LiAlSiO4-SiO2 join
  12. The transformation of andalusite to mullite and silica: Part I. Transformation mechanism in [001]A direction
  13. The transformation of andalusite to mullite and silica: Part II. Transformation mechanisms in [100]A and [010]A directions
  14. Structure and twinning of tetragonal Ca3Mn2Ge3O12 garnet
  15. The equation of state of lawsonite to 7 GPa and 873 K, and calculation of its high pressure stability
  16. Boron K-edge XANES of borate and borosilicate minerals
  17. 113Cd double-resonance NMR as a probe of clay mineral cation exchange sites
  18. Solid state NMR study of oxygen site exchange and Al-O-Al site concentration in analcime
  19. Isomorphous substitution effect on the vibration frequencies of hydroxyl groups in molecular cluster models of the clay octahedral sheet
  20. Molecular modeling of the structure and dynamics of the interlayer and surface species of mixed-metal layered hydroxides: Chloride and water in hydrocalumite (Friedel’s salt)
  21. VIII(Mg,Fe)0.85VI(Mg,Fe)4IV(Fe,Ge)3O12: A new tetragonal phase and its comparison with garnet
  22. Rietveld analysis of dicalcium aluminate (Ca2Al2O5) – A new high pressure phase with the Brownmillerite-type structure
  23. Suredaite, PbSnS3, a new mineral species, from the Pirquitas Ag-Sn deposit, NW-Argentina: mineralogy and crystal structure
  24. Kozoite-(Nd), Nd(CO3)(OH), a new mineral in an alkali olivine basalt from Hizen-cho, Saga Prefecture, Japan
  25. Florenskyite, FeTiP, a new phosphide from the Kaidun meteorite
  26. Letters. Computer simulation of high-temperature, forsterite-melt partitioning
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