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Stacking structures in pyrophyllite revealed by high-resolution transmission electron microscopy (HRTEM)

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Published/Copyright: March 31, 2015
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American Mineralogist
From the journal American Mineralogist Volume 91 Issue 8-9

Abstract

Stacking structures in pyrophyllite, Al2Si4O10(OH)2, were investigated mainly by using high-resolution transmission electron microscopy (HRTEM). The specimens examined were large lath-shaped crystals (Berosovska, Urals, Russia) and massive aggregates of fine platy crystals (Nohwa, southwest Korea). Both specimens showed powder X-ray diffraction (XRD) patterns similar to those reported previously as the 2M polytype. The common stacking sequence in the two specimens is not monoclinic with two-layer periodicity as previously reported, but a uniform orientation of the 2:1 layers and near complete disorder of two alternative directions of interlayer displacement, i.e., lateral displacement between the two tetrahedral sheets across an interlayer region. The directions of interlayer displacement are about ± 2π/3 from that of the intralayer shift (lateral displacement between the two tetrahedral sheets within a 2:1 layer). Simulation of powder XRD patterns by this stacking model closely approximates the experimental pattern. Elongation of the lath-shaped Berosovska crystals corresponds to the direction of the intralayer shift, as seen in illite-1M.

2:1 layers with different orientations, and interlayer displacement almost parallel to the intralayer shift, were occasionally observed as stacking faults. Such disorder occurs more frequently in the massive Nohwa specimen than in the Berosovska specimen. Sub-micrometer domains of the 2M stacking sequence with regular alternation of the two directions of interlayer displacement were found in the Nohwa specimen.

Keywords : Crystal structure; pyrophyllite; electron microscopy; order-disorder; XRD data
Received: 2005-06-03
Accepted: 2006-03-28
Published Online: 2015-03-31
Published in Print: 2006-08-01

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2006.1997
Keywords for this article
Crystal structure; pyrophyllite; electron microscopy; order-disorder; XRD data

Articles in the same Issue

  1. Low-temperature Zr mobility: An in situ synchrotron-radiation XRF study of the effect of radiation damage in zircon on the element release in H2O + HCl ± SiO2 fluids
  2. Magnetic properties, microstructure, composition, and morphology of greigite nanocrystals in magnetotactic bacteria from electron holography and tomography
  3. Site preference and local geometry of Sc in garnets: Part I. Multifarious mechanisms in the pyrope-grossular join
  4. Site preference and local geometry of Sc in garnets: Part II. The crystal-chemistry of octahedral Sc in the andradite–Ca3Sc2Si3O12 join
  5. The arrojadite enigma: I. A new formula and a new model for the arrojadite structure
  6. The arrojadite enigma: II. Compositional space, new members, and nomenclature of the group
  7. Single-crystal X-ray diffraction and temperature dependent 57Fe Mössbauer spectroscopy on the hedenbergite-aegirine (Ca,Na)(Fe2+,Fe3+)Si2O6 solid solution
  8. Stacking structures in pyrophyllite revealed by high-resolution transmission electron microscopy (HRTEM)
  9. Intensity of quartz cathodoluminescence and trace-element content in quartz from the porphyry copper deposit at Butte, Montana
  10. The fate of smectite in KOH solutions
  11. Light-induced changes in molecular arsenic sulfides: State of the art and new evidence by single-crystal X-ray diffraction
  12. Verifying and quantifying carbon Þ xation in minerals from serpentine-rich mine tailings using the Rietveld method with X-ray powder diffraction data
  13. Generation of pressures to ~60 GPa in Kawai-type apparatus and stability of MnGeO3 perovskite at high pressure and high temperature
  14. A model to predict phase equilibrium of CH4 and CO2 clathrate hydrate in aqueous electrolyte solutions
  15. Raman investigation of H2O molecule and hydroxyl groups in the channels of hemimorphite
  16. Stacking structure in disordered talc: Interpretation of its X-ray diffraction pattern by using pattern simulation and high-resolution transmission electron microscopy
  17. Electrical conductivities of pyrope-almandine garnets up to 19 GPa and 1700 °C
  18. Crystal chemistry and polytypism of tyrolite
  19. Effect of melt structure on trace-element partitioning between clinopyroxene and silicic, alkaline, aluminous melts
  20. Analysis of light lithophile elements (Li, Be, B) by laser ablation ICP-MS: Comparison between magnetic sector and quadrupole ICP-MS
  21. Stornesite-(Y), (Y, Ca)⃞2Na6(Ca,Na)8(Mg,Fe)43(PO4)36, the first terrestrial Mg-dominant member of the fillowite group, from granulite-facies paragneiss in the Larsemann Hills, Prydz Bay, East Antarctica
  22. Electron paramagnetic resonance spectroscopic study of carbonate-bearing fluorapatite: New defect centers and constraints on the incorporation of carbonate ions in apatites
  23. EXAFS signature of structural Zn at trace levels in natural and synthetic trioctahedral 2:1 phyllosilicates
  24. A neutron powder diffraction study of Fe and Ni distributions in synthetic pentlandite and violarite using 60Ni isotope
  25. Letter. Quantification of amphibole content in expanded vermiculite products from Libby, Montana U.S.A. using powder X-ray diffraction
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