Articles | Volume 35, issue 2
https://doi.org/10.5194/ejm-35-199-2023
https://doi.org/10.5194/ejm-35-199-2023
Research article
 | 
30 Mar 2023
Research article |  | 30 Mar 2023

Cation and anion ordering in synthetic lepidolites and lithian muscovites: influence of the OH ∕ F and Li ∕ Al ratios on the mica formation studied by NMR (nuclear magnetic resonance) spectroscopy and X-ray diffraction

Lara Sulcek, Bernd Marler, and Michael Fechtelkord

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Ordering of tetrahedral and octahedral layers in synthetic lepidolites and Li-muscovites: two-dimensional {1H} → 29Si ∕ 27Al CPMAS HETCOR and {19F} → 29Si ∕ 27Al CPMAS HETCOR spectroscopy
Michael Fechtelkord and Lara Sulcek
Eur. J. Mineral., 37, 877–888, https://doi.org/10.5194/ejm-37-877-2025,https://doi.org/10.5194/ejm-37-877-2025, 2025
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Cited articles

Alba, M. D., Becerro, A. I., Castro, M. A., and Perdigón, A. C.: High-resolution 1H MAS NMR spectra of 2 : 1 phyllosilicates, Chem. Commun., 37–38, https://doi.org/10.1039/a906577f, 2000. 
Bailey, S. W. and Christie, O.: Three-layer monoclinic lepidolite from Tordal, Norway, Am. Mineral., 63, 203–204, 1978. 
Boukili, B., Robert, J.-L., Beny, J.-M., and Holtz, F.: Structural effects of OH – F substitution in trioctahedral micas of the system: K2O-FeO-Fe2O3-Al2O3-SiO2-H2O-HF, Schweiz. Miner. Petrog., 81, 55–67, 2001. 
Boukili, B., Holtz, F., Beny, J.-M., and Robert, J.-L.: “Fe-F and Al-F avoidance rule” in ferrous-aluminous (OH,F) biotites, Schweiz. Miner. Petrog., 82, 549–559, 2002. 
Černý, P. and Burt, D. M.: Paragenesis, crystallochemical characteristics, and geochemical evolution of the micas in granite pegmatites, Rev. Mineral. Geochem., 13, 257–297, 1984. 
Short summary
Synthetic lepidolites and Li-muscovites were characterised by nuclear magnetic resonance (NMR) spectroscopy and X-ray diffraction. Both Li and F / OH content influence the occurrence of the impurity phases. A solid solution series exists for lepidolites with polylithionite and trilithionite as endmembers but does not between trilithionite and muscovite. NMR investigations indicate there is a preference for incorporating fluorine and OH groups near Li-rich and Al-rich environments, respectively.
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