European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 38, issue 1
Articles | Volume 38, issue 1
https://doi.org/10.5194/ejm-38-75-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-38-75-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 38, issue 1
Research article
 | 
24 Feb 2026
Research article |  | 24 Feb 2026

Crystal structure, chemical composition, and twinning of götzenite and wöhlerite from the Fohberg phonolite, Kaiserstuhl

Reinhard X. Fischer, Johannes Birkenstock, Georg Biskup, Lennart A. Fischer, Andreas Klügel, Shaghayegh Nezamabadi, and Simon Spürgin

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Short summary
Götzenite and wöhlerite were found as part of a fissure assemblage in the Fohberg phonolite (Kaiserstuhl, SW Germany) in close contact to each other. Götzenite shows rotation twinning on [001], and wöhlerite shows reflection twinning on (100). Götzenite represents a special case, where the twin domains are arranged in a certain way with the main axis nx of the optical indicatrix being parallel to the twin axis c in both domains.
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