Articles | Volume 32, issue 2
Eur. J. Mineral., 32, 235–249, 2020
https://doi.org/10.5194/ejm-32-235-2020
Eur. J. Mineral., 32, 235–249, 2020
https://doi.org/10.5194/ejm-32-235-2020

Research article 11 Mar 2020

Research article | 11 Mar 2020

Mullite-2c – a natural polytype of mullite

Stephan Lenz et al.

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Short summary
A mineral from Ettringer Bellerberg (Eifel, Germany) proved to be a polytype of the important ceramic-phase mullite termed mullite-2c, with – similar to sillimanite – doubling of the c lattice parameter due to strong (Si,Al) order in tetrahedral diclusters and – similar to mullite – presence of oxygen vacancies and tetrahedral triclusters due to Al / Si > 1 in diclusters. Crystals were characterised using single-crystal XRD, electron microprobe analysis (EMPA) and spindle-stage optical methods.