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Chessboard structures: Atom-scale imaging of homologs from the kobellite series

  • Wei Li , Cristiana L. Ciobanu EMAIL logo , Ashley Slattery , Nigel J. Cook , Wenyuan Liu , Benjamin P. Wade and Guiqing Xie
Published/Copyright: February 26, 2019
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American Mineralogist
From the journal American Mineralogist Volume 104 Issue 3

Abstract

High-angle annular dark-field scanning transmission electron microscopy is a powerful Z-contrast technique able to depict the structural motifs in Pb-(Bi-Sb)-sulfosalts. Using two homologs from the kobellite homologous series, a group of “chessboard derivative structures,” represented by Bi-, and Sb-rich pairs of natural phases (the kobellite-tintinaite isotypic series and giessenite-izoklakeite homeotypic series), we visualize the slabs underpinning crystal structural modularity for the N = 2 homolog kobellite and the N = 4 homolog, in this case a Bi-rich izoklakeite [Sb/(Sb+Bi) = 0.35]. The homolog number, N, can be readily calculated as N = n1/6 – 1 and N = n2/4, where n1 and n2 are the numbers of atoms in the PbS- and SnS-motifs, respectively. Atom-scale imaging of thinned foils extracted in situ from samples for which compositional data are available also reveals syntactic unit-cell scale intergrowths on [001] zone axis with akobeiiite ∥ bizoidakefa. These are as small as half-unit cells of bizokiakeite and one-unit cell akobellite. Replacement relationships are also observed as irregular slabs of kobellite “intruding” into izoklakeite. Both banded and irregular intergrowths account for the compositional fields measured at the micrometer scale.

Keywords: HAADF STEM; chessboard structures; izoklakeite; kobellite

Acknowledgments and Funding

We acknowledge the AMMRF for instrument access. Financial support for W.L. was provided by the National “973” Program of China (2014CB440902), the National Science Foundation of China (41573042 and 41372090), and the MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences (ZS1702). Comments from Yves Moëlo and two anonymous reviewers allowed us to clarify aspects of this manuscript.

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Received: 2018-10-26
Accepted: 2018-12-11
Published Online: 2019-02-26
Published in Print: 2019-03-26

© 2019 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Letter
  2. Chessboard structures: Atom-scale imaging of homologs from the kobellite series
  3. Special collection: Microporous materials: Crystal-chemistry, properties, and utilizations
  4. Highlighting the capability of zeolites for agro-chemicals contaminants removal from aqueous matrix: Evidence of 2-ethyl-6-methylaniline adsorption on ZSM-12
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  7. Special collection: Isotopes, minerals, and petrology: Honoring John Valley
  8. Application of mineral equilibria to estimate fugacities of H2O, H2, and O2 in mantle xenoliths from the southwestern U.S.A.
  9. Review
  10. Composition, paragenesis, and alteration of the chevkinite group of minerals
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  14. Micro- and nano-scale textural and compositional zonation in plagioclase at the Black Mountain porphyry Cu deposit: Implications for magmatic processes
  15. A XANES and EPMA study of Fe3+ in chlorite: Importance of oxychlorite and implications for cation site distribution and thermobarometry
  16. Sound velocities across calcite phase transitions by Brillouin scattering spectroscopy
  17. Trace element distributions in (Cu)-Pb-Sb sulfosalts from the Gutaishan Au-Sb deposit, South China: Implications for formation of high fineness native gold
  18. A-type carbonate in strontium phosphate apatites
  19. Discovery of a zinc-rich mineral on the surface of lunar orange pyroclastic beads
  20. In-situ mapping of ferric iron variations in lunar glasses using X-ray absorption spectroscopy
  21. Book Review
  22. Book Review
https://doi.org/10.2138/am-2019-6860
Keywords for this article
HAADF STEM; chessboard structures; izoklakeite; kobellite

Articles in the same Issue

  1. Letter
  2. Chessboard structures: Atom-scale imaging of homologs from the kobellite series
  3. Special collection: Microporous materials: Crystal-chemistry, properties, and utilizations
  4. Highlighting the capability of zeolites for agro-chemicals contaminants removal from aqueous matrix: Evidence of 2-ethyl-6-methylaniline adsorption on ZSM-12
  5. Special collection: Physics and chemistry of earth's deep mantle and core
  6. Origin and consequences of non-stoichiometry in iron carbide Fe7C3
  7. Special collection: Isotopes, minerals, and petrology: Honoring John Valley
  8. Application of mineral equilibria to estimate fugacities of H2O, H2, and O2 in mantle xenoliths from the southwestern U.S.A.
  9. Review
  10. Composition, paragenesis, and alteration of the chevkinite group of minerals
  11. Articles
  12. Spinel-anorthosites on the Moon: Impact melt origins suggested by enthalpy constraints
  13. Fast diffusion path for water in silica glass
  14. Micro- and nano-scale textural and compositional zonation in plagioclase at the Black Mountain porphyry Cu deposit: Implications for magmatic processes
  15. A XANES and EPMA study of Fe3+ in chlorite: Importance of oxychlorite and implications for cation site distribution and thermobarometry
  16. Sound velocities across calcite phase transitions by Brillouin scattering spectroscopy
  17. Trace element distributions in (Cu)-Pb-Sb sulfosalts from the Gutaishan Au-Sb deposit, South China: Implications for formation of high fineness native gold
  18. A-type carbonate in strontium phosphate apatites
  19. Discovery of a zinc-rich mineral on the surface of lunar orange pyroclastic beads
  20. In-situ mapping of ferric iron variations in lunar glasses using X-ray absorption spectroscopy
  21. Book Review
  22. Book Review
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