Articles | Volume 32, issue 2
Eur. J. Mineral., 32, 265–273, 2020
https://doi.org/10.5194/ejm-32-265-2020
Eur. J. Mineral., 32, 265–273, 2020
https://doi.org/10.5194/ejm-32-265-2020

Research article 02 Apr 2020

Research article | 02 Apr 2020

Heliophyllite: a discredited mineral species identical to ecdemite

Natale Perchiazzi et al.

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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.