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Physics and Chemistry of Minerals

, Volume 46, Issue 3, pp 259–270 | Cite as

Chemical and structural studies of coexisting 1M- and 2M1-polytypes in synthetic fluorophlogopites and influence of Al on the polytype formation

  • Aiqing Chen
  • Wei Tan
  • Hongping HeEmail author
  • Guowu Li
  • Xinye Wu
  • Qi Tao
  • Jianxi Zhu
Original Paper
  • 108 Downloads

Abstract

Polytyism of micas is ubiquitous in natural rocks and can be used as an indicator of physical and chemical conditions in related diagenetic processes. To reveal the formation mechanisms of different polytypes, 1M- and 2M1-fluorophlogopite were synthesized using the melting method, and experiments with different Al concentration in the initial reactants were also performed. The structure refinement indicates that the space group of the 1M-fluorophlogopite is C2/m, and the lattice parameters are a = 5.2941(4) Å, b = 9.1773(6) Å, c = 10.1061(7) Å, β = 100.141(7)°. The space group of the 2M1-fluorophlogopite is C2/c, and the lattice parameters are a = 5.3094(16) Å, b = 9.1973(28) Å, c = 20.0442(60) Å, β = 95.141(7)°. The isomorphous substitution of Al3+ for Si4+ in tetrahedral sites of fluorophlogopite causes distortion in the layer structure, and results in a larger tetrahedral rotation angle α, longer tetrahedral bond distance, smaller tetrahedral flattening angle τ, larger bond length difference between inner and outer potassium–oxygen (∆〈K–O〉mean), and relative higher value of octahedral flattening angle ψ. Our experimental results suggest that the content of structural Al has no correlation with the polytype formation, whereas the Al concentration in reactants influences the formation of 1M- and 2M1-fluorophlogopite.

Keywords

Fluorophlogopite Crystal structure Polytype formation Structural distortion 

Notes

Acknowledgements

This study was financially supported by National Natural Science Foundation of China (Grant nos. 41530313, 41772039) and Key Research Program of Frontier Sciences, CAS (Grant no. QYZDJ-SSW-DQC023). We thank Zier Yan for providing the software of CrysAlisPro, and Prof. Huifang Xu and Dr. Yuebo Wang for their constructive suggestions.

Supplementary material

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Supplementary material 1 (CIF 20 KB)
269_2018_1002_MOESM2_ESM.cif (24 kb)
Supplementary material 2 (CIF 25 KB)
269_2018_1002_MOESM3_ESM.doc (983 kb)
Supplementary material 3 (DOC 983 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Aiqing Chen
    • 1
    • 2
  • Wei Tan
    • 1
  • Hongping He
    • 1
    • 2
    Email author
  • Guowu Li
    • 3
  • Xinye Wu
    • 3
  • Qi Tao
    • 1
  • Jianxi Zhu
    • 1
  1. 1.CAS Key Laboratory of Mineralogy and Metallogeny/ Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhouChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.China University of Geosciences (Beijing)BeijingChina

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