European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 38, issue 6
Articles | Volume 38, issue 6
https://doi.org/10.5194/ejm-38-655-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-38-655-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 38, issue 6
Research article
 | 
05 Nov 2026
Research article |  | 05 Nov 2026

Asymmetrical compositional gap between muscovite and NH4-bearing micas – structural constraints: a combined experimental–theoretical study

Fernando Nieto, Elizabeth Escamilla-Roa, Vicente Timón, Josefina Pedrajas, María del Mar Abad, and Blanca Bauluz

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Short summary
Differences in the interlayer between NH₄ and K micas, caused by H bonds in the former, explain forbidden mixed compositions near the K endmember. The areas of the samples with these compositions resolve their energetically unfavourable nature through the coexistence, at the nanoscale, of muscovite (and/or illite) with NH₄ micas containing varying proportions of K. For all other NH4/K ratios, continuous solid-solution series exits as these compositions are energetically favourable.
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