Startseite Naturwissenschaften Transmission electron microscopy study of gaudefroyite, Ca8Mn6 3+[(BO3)6(CO3)2O6]
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Transmission electron microscopy study of gaudefroyite, Ca8Mn6 3+[(BO3)6(CO3)2O6]

  • Ishmael Hassan EMAIL logo
Veröffentlicht/Copyright: 25. März 2015
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 85 Heft 9

Abstract

A transmission electron microscopy (TEM) study of gaudefroyite, Ca8Mn3+ 6[(BO3)6(CO3)2O6], from the Wessels mine, Kalahari manganese field, South Africa, shows strong, continuous streaking in selected-area electron diffraction (SAED) patterns. The pseudo-hexagonal parameters for gaudefroyite are a = 10.606(1) and c = 5.896(1) Å. The symmetry of gaudefroyite is lower than hexagonal because of the streaked reflections. The CO3 groups in the large 63 channels are ordered in two different ways and this ordering gives rise to two different types of channels, A and B. The A and B channels occur in a 1:1 ratio and these channels are partially ordered and give rise to the continuous streak reflections in gaudefroyite.

Received: 1999-6-15
Accepted: 2000-3-28
Published Online: 2015-3-25
Published in Print: 2000-8-1

© 2015 by Walter de Gruyter Berlin/Boston

Artikel in diesem Heft

  1. Measurement of crystal size distributions
  2. Pressure dependence of the solubility of Ar and Kr in melts of the system SiO2-NaAlSi2O6
  3. Solubility behavior of water in haploandesitic melts at high pressure and high temperature
  4. Proton-containing defects at forsterite {010} tilt grain boundaries and stepped surfaces
  5. Incorporation of Fe3+ into forsterite and wadsleyite
  6. Molecular dynamics simulation of Al/Si-ordered plagioclase feldspar
  7. Cation ordering and structural variations with temperature in MgAl2O4 spinel: An X-ray single-crystal study
  8. Aluminium coordination in tektites: A XANES study
  9. Crystal structure of Cr-mullite
  10. Structure of synthetic 2-line ferrihydrite by electron nanodiffraction
  11. Transmission electron microscopy study of gaudefroyite, Ca8Mn6 3+[(BO3)6(CO3)2O6]
  12. Nano- to micro-scale decompression products in ultrahigh-pressure phengite: HRTEM and AEM study, and some petrological implications
  13. New insights into the mechanism for chloritization of biotite using polytype analysis
  14. The dissolution of hectorite: In-situ, real-time observations using atomic force microscopy
  15. Quantification of minor phases in growth kinetics experiments with powder X-ray diffraction
  16. Illite-smectite structural changes during metamorphism in black Cambrian Alum shales from the Baltic area
  17. The tremolite-actinolite-ferro–actinolite series: Systematic relationships among cell parameters, composition, optical properties, and habit, and evidence of discontinuities
  18. Cordierite I: The coordination of Fe2+
  19. Cordierite II: The role of CO2 and H2O
  20. Crystal chemical variations in Li- and Fe-rich micas from Pikes Peak batholith (central Colorado)
  21. The crystal structure of TlAlSiO4: The role of inert pairs in exclusion of Tl from silicate minerals
  22. The structure of agrinierite: a Sr-containing uranyl oxide hydrate mineral
  23. The crystal structure of namibite, Cu(BiO)2VO4(OH), and revision of its symmetry
  24. The crystal structure of pararobertsite and its relationship to mitridatite
  25. Description and crystal structure of cabalzarite Ca(Mg,Al,Fe)2(AsO4)2(H2O,OH)2, a new mineral of the tsumcorite group
  26. Tegengrenite, a new, rhombohedral spinel-related Sb mineral from the Jakobsberg Fe-Mn deposit, Värmland, Sweden
https://doi.org/10.2138/am-2000-8-911

Artikel in diesem Heft

  1. Measurement of crystal size distributions
  2. Pressure dependence of the solubility of Ar and Kr in melts of the system SiO2-NaAlSi2O6
  3. Solubility behavior of water in haploandesitic melts at high pressure and high temperature
  4. Proton-containing defects at forsterite {010} tilt grain boundaries and stepped surfaces
  5. Incorporation of Fe3+ into forsterite and wadsleyite
  6. Molecular dynamics simulation of Al/Si-ordered plagioclase feldspar
  7. Cation ordering and structural variations with temperature in MgAl2O4 spinel: An X-ray single-crystal study
  8. Aluminium coordination in tektites: A XANES study
  9. Crystal structure of Cr-mullite
  10. Structure of synthetic 2-line ferrihydrite by electron nanodiffraction
  11. Transmission electron microscopy study of gaudefroyite, Ca8Mn6 3+[(BO3)6(CO3)2O6]
  12. Nano- to micro-scale decompression products in ultrahigh-pressure phengite: HRTEM and AEM study, and some petrological implications
  13. New insights into the mechanism for chloritization of biotite using polytype analysis
  14. The dissolution of hectorite: In-situ, real-time observations using atomic force microscopy
  15. Quantification of minor phases in growth kinetics experiments with powder X-ray diffraction
  16. Illite-smectite structural changes during metamorphism in black Cambrian Alum shales from the Baltic area
  17. The tremolite-actinolite-ferro–actinolite series: Systematic relationships among cell parameters, composition, optical properties, and habit, and evidence of discontinuities
  18. Cordierite I: The coordination of Fe2+
  19. Cordierite II: The role of CO2 and H2O
  20. Crystal chemical variations in Li- and Fe-rich micas from Pikes Peak batholith (central Colorado)
  21. The crystal structure of TlAlSiO4: The role of inert pairs in exclusion of Tl from silicate minerals
  22. The structure of agrinierite: a Sr-containing uranyl oxide hydrate mineral
  23. The crystal structure of namibite, Cu(BiO)2VO4(OH), and revision of its symmetry
  24. The crystal structure of pararobertsite and its relationship to mitridatite
  25. Description and crystal structure of cabalzarite Ca(Mg,Al,Fe)2(AsO4)2(H2O,OH)2, a new mineral of the tsumcorite group
  26. Tegengrenite, a new, rhombohedral spinel-related Sb mineral from the Jakobsberg Fe-Mn deposit, Värmland, Sweden
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