Articles | Volume 35, issue 2
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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Cited articles

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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.