European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 32, issue 2
Articles | Volume 32, issue 2
https://doi.org/10.5194/ejm-32-265-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-32-265-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 32, issue 2
Research article
 | 
02 Apr 2020
Research article |  | 02 Apr 2020

Heliophyllite: a discredited mineral species identical to ecdemite

Natale Perchiazzi, Ulf Hålenius, Nicola Demitri, and Pietro Vignola

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Latest update: 09 Jul 2025
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Short summary
Type material for heliophyllite, preserved in the Swedish Museum of Natural History in Stockholm, was re-investigated through a combined EPMA (electron probe X-ray microanalysis), Raman, and X-ray powder diffraction (XRPD) and single-crystal study. EPMA chemical data, together with Raman and single-crystal structural studies, point to heliophyllite being identical to ecdemite. XRPD synchrotron data highlight the presence of a minor quantity of finely admixed finnemanite in the analyzed material.
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