European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 35, issue 5
Articles | Volume 35, issue 5
https://doi.org/10.5194/ejm-35-755-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-35-755-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 35, issue 5
Research article
 | 
15 Sep 2023
Research article |  | 15 Sep 2023

Genetic model for the color anomalies at the termination of pegmatitic gem tourmaline crystals from the island of Elba, Italy

Alessandra Altieri, Federico Pezzotta, Giovanni B. Andreozzi, Henrik Skogby, and Ferdinando Bosi

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Latest update: 10 May 2025
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Short summary
Elba tourmaline crystals commonly display a sharp transition to dark colors at the analogous termination, but the mechanisms leading to the formation of such terminations are unclear. Here we propose a general genetic model in which, as a consequence of a pocket rupture event, chemical alteration of early formed Fe-/Mn-rich minerals in the enclosing pegmatite was responsible for the release of Fe and/or Mn in the geochemical system, allowing the formation of the late-stage dark terminations.
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