Home Crystal chemistry of chromian pumpellyite from Osayama, Okayama Prefecture, Japan
Article
Licensed
Unlicensed Requires Authentication

Crystal chemistry of chromian pumpellyite from Osayama, Okayama Prefecture, Japan

  • Maki Hamada EMAIL logo , Masahide Akasaka , Shizue Seto and Kuniaki Makino
Published/Copyright: April 2, 2015
Become an author with De Gruyter Brill
Author Information
American Mineralogist
From the journal American Mineralogist Volume 95 Issue 8-9

Abstract

The crystal structure and crystal chemistry of chromian pumpellyite from basic schist in the Osayama ultramafic body, Okayama, Japan, were investigated using electron probe microanalysis (EPMA), Fourier transform infrared spectroscopy (FTIR), and single-crystal X-ray diffraction to determine the distribution of chromium between two independent octahedral sites and structural changes caused by ionic substitutions in pumpellyite, VIIW8VIX4VIY8 IVZ12O56-n(OH)n (Z = 1). Five chromian pumpellyite crystals (ocp1211, ocp0604, ocp1028, ocp1013, and ocp1016) with 0.52, 1.65, 1.26, 1.94, and 1.43 Cr atoms per formula unit (apfu) (EPMA data), respectively, were picked from a hand specimen for X-ray diffraction analysis. The crystal structures (space group C2/m) of ocp1211 [a = 19.1129(6), b = 5.8963(5), c = 8.818(1) Å, β = 97.449(2)°], ocp0604 [a = 19.0935(4), b = 5.900(1), c = 8.810(2) Å, β = 97.540(7)°], ocp1028 [a = 19.105(2), b = 5.9021(6), c = 8.8143(7) Å, β = 97.513(3)°], ocp1013 [a = 19.1558(6), b = 5.9125(9), c = 8.844(1) Å, β = 97.448(4)°], and ocp1016 [a = 19.174(3), b = 5.9194(8), c = 8.830(1) Å, β = 97.497(4)°] were refined using 1058, 829, 1070, 1105, and 1095 unique reflections, and calculations converged at R factors of 4.08, 5.02, 6.32, 6.92, and 7.88%, respectively. The resulting site populations at the X and Y sites are (Mg1.88Al1.51Fe2+0.38 Cr0.16Mn2+0.05Ni0.02)X(Al7.90Ti0.07V0.03)Y for ocp1211, (Mg1.81Al1.53Cr0.42Fe2+0.18Mn2+0.04Ni0.01)X(Al7.34Cr0.65V0.01)Y for ocp0604, (Al1.62Mg1.60Cr0.61Fe2+ 0.13 Mn2+0.03Ni0.01)X(Al7.36Cr0.61V0.03)Y for ocp1028, (Mg1.79Al1.33Cr0.47 Fe2+0.33Mn2+0.08)X(Al6.66Cr1.31V0.03)Y for ocp1013, and (Mg1.94Al1.23Cr0.38Fe2+0.37Mn2+0.08)X(Al6.72Cr1.25V0.03)Y for ocp1016. Cr3+ ions in ocp1211 are distributed only in the X site. The distribution coefficient of Cr and Al between the X and Y sites [(Cr/Al)X/(Cr/Al)Y] is 1.66, 1.79, 3.09, and 4.54 for ocp1016, ocp1013, ocp0604, and ocp1028, respectively, indicating a stronger preference of Cr for the X site than the Y site. The a and b axes increase with increasing Cr content, whereas the c axis is almost constant. The mean Y-O distances increase linearly with increased Cr3+ content in the Y site. However, the mean X-O distances do not depend on the substitution of Cr3+ for Al3+ at the X site.

The bond valence sums and the difference-Fourier synthesis indicate that hydroxyl groups are located at the O5, O7, O10, and O11 positions. FTIR spectrum shows main absorption bands at ca. 2911, 3220, 3397, and 3512 cm-1 of OH-stretching vibrations, indicating the presence of OH⋅⋅⋅O hydrogen bonds.

Keywords: Pumpellyite; chromium; X-ray structural analysis; crystal chemistry; FTIR
Received: 2009-8-19
Accepted: 2010-4-11
Published Online: 2015-4-2
Published in Print: 2010-8-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Resonant X-ray emission study of the lower-mantle ferropericlase at high pressures
  2. Uranyl phosphate sheet reconstruction during dehydration of metatorbernite [Cu(UO2)2(PO4)2·8H2O]
  3. Detection of structurally bound hydroxyl in fluorapatite from Apollo Mare basalt 15058,128 using TOF-SIMS
  4. Quantum-mechanical evaluation of Np-incorporation into studtite
  5. Electronic structure and local environment of substitutional V3+ in grossular garnet Ca3Al2(SiO4)3: K-edge X-ray absorption spectroscopy and first-principles modeling
  6. Elbrusite-(Zr)—A new uranian garnet from the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia
  7. What drives the distribution in nature of 3T vs. 2M1 polytype in muscovites and phengites? A general assessment based on new data from metamorphic and igneous granitoid rocks
  8. Radiation damage and uranium concentration in zircon as assessed by Raman spectroscopy and neutron irradiation
  9. The Cr X-ray absorption K-edge structure of poorly crystalline Fe(III)-Cr(III)-oxyhydroxides
  10. Protracted oceanic subduction prior to continental subduction: New Lu-Hf and Sm-Nd geochronology of oceanic-type high-pressure eclogite in the western Dabie orogen
  11. Time-resolved in situ studies of apatite formation in aqueous solutions
  12. X-ray Rietveld and 57Fe Mössbauer studies of epidote and piemontite on the join Ca2Al2Fe3+Si3O12(OH)–Ca2Al2Mn3+Si3O12(OH) formed by hydrothermal synthesis
  13. Elastic behavior of zeolite boggsite in silicon oil and aqueous medium: A case of high-pressure-induced over-hydration
  14. Low-temperature infrared spectroscopic study of OH-stretching modes in kaolinite and dickite
  15. Stability field of the high-temperature orthorhombic phase in the enstatite-diopside system
  16. Unique crystal chemistry of two polymorphs of topaz-OH: A multi-nuclear NMR and Raman study
  17. Crystal chemistry of chromian pumpellyite from Osayama, Okayama Prefecture, Japan
  18. Toturite Ca3Sn2Fe2SiO12—A new mineral species of the garnet group
  19. The structure of schwertmannite, a nanocrystalline iron oxyhydroxysulfate
  20. Crystal chemistry of Cr-spinels from the lherzolite mantle peridotite of Ronda (Spain)
  21. Lead-tellurium oxysalts from Otto Mountain near Baker, California: I. Ottoite, Pb2TeO5, a new mineral with chains of tellurate octahedra
  22. Lead-tellurium oxysalts from Otto Mountain near Baker, California: II. Housleyite, Pb6CuTe4O18(OH)2, a new mineral with Cu-Te octahedral sheets
  23. The behavior of the Hf isotope system in radiation-damaged zircon during experimental hydrothermal alteration
  24. Letter. Crystal structure of a new high-pressure polymorph of topaz-OH
  25. Letter. In situ 238U-230Th disequilibrium dating of pyrochlore at sub-millennial precision
https://doi.org/10.2138/am.2010.3376
Keywords for this article
Pumpellyite; chromium; X-ray structural analysis; crystal chemistry; FTIR

Articles in the same Issue

  1. Resonant X-ray emission study of the lower-mantle ferropericlase at high pressures
  2. Uranyl phosphate sheet reconstruction during dehydration of metatorbernite [Cu(UO2)2(PO4)2·8H2O]
  3. Detection of structurally bound hydroxyl in fluorapatite from Apollo Mare basalt 15058,128 using TOF-SIMS
  4. Quantum-mechanical evaluation of Np-incorporation into studtite
  5. Electronic structure and local environment of substitutional V3+ in grossular garnet Ca3Al2(SiO4)3: K-edge X-ray absorption spectroscopy and first-principles modeling
  6. Elbrusite-(Zr)—A new uranian garnet from the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia
  7. What drives the distribution in nature of 3T vs. 2M1 polytype in muscovites and phengites? A general assessment based on new data from metamorphic and igneous granitoid rocks
  8. Radiation damage and uranium concentration in zircon as assessed by Raman spectroscopy and neutron irradiation
  9. The Cr X-ray absorption K-edge structure of poorly crystalline Fe(III)-Cr(III)-oxyhydroxides
  10. Protracted oceanic subduction prior to continental subduction: New Lu-Hf and Sm-Nd geochronology of oceanic-type high-pressure eclogite in the western Dabie orogen
  11. Time-resolved in situ studies of apatite formation in aqueous solutions
  12. X-ray Rietveld and 57Fe Mössbauer studies of epidote and piemontite on the join Ca2Al2Fe3+Si3O12(OH)–Ca2Al2Mn3+Si3O12(OH) formed by hydrothermal synthesis
  13. Elastic behavior of zeolite boggsite in silicon oil and aqueous medium: A case of high-pressure-induced over-hydration
  14. Low-temperature infrared spectroscopic study of OH-stretching modes in kaolinite and dickite
  15. Stability field of the high-temperature orthorhombic phase in the enstatite-diopside system
  16. Unique crystal chemistry of two polymorphs of topaz-OH: A multi-nuclear NMR and Raman study
  17. Crystal chemistry of chromian pumpellyite from Osayama, Okayama Prefecture, Japan
  18. Toturite Ca3Sn2Fe2SiO12—A new mineral species of the garnet group
  19. The structure of schwertmannite, a nanocrystalline iron oxyhydroxysulfate
  20. Crystal chemistry of Cr-spinels from the lherzolite mantle peridotite of Ronda (Spain)
  21. Lead-tellurium oxysalts from Otto Mountain near Baker, California: I. Ottoite, Pb2TeO5, a new mineral with chains of tellurate octahedra
  22. Lead-tellurium oxysalts from Otto Mountain near Baker, California: II. Housleyite, Pb6CuTe4O18(OH)2, a new mineral with Cu-Te octahedral sheets
  23. The behavior of the Hf isotope system in radiation-damaged zircon during experimental hydrothermal alteration
  24. Letter. Crystal structure of a new high-pressure polymorph of topaz-OH
  25. Letter. In situ 238U-230Th disequilibrium dating of pyrochlore at sub-millennial precision
Sign up now to receive a 20% welcome discount
Institutional Access
How does access work?
Have an idea on how to improve our website?
Please write us.
© 2025 De Gruyter Brill
Downloaded on 18.9.2025 from https://www.degruyterbrill.com/document/doi/10.2138/am.2010.3376/html
Scroll to top button