Articles | Volume 32, issue 2
Eur. J. Mineral., 32, 265–273, 2020
Eur. J. Mineral., 32, 265–273, 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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Cited articles

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Aurivillius, B.: On the crystal structure of some non-stoichiometric mixed lead oxide halides and their relation to the minerals “lorettoite” and sundiusite, Chem. Scripta, 22, 5–11, 1983. 
Boher, P., Garnier, P., Gavarri, J. R., and Hewat, A. W.: Monoxyde quadratique PbOα (I): Description de la transition structurale ferroélastique, J. Solide State Chem., 57, 343–350, 1985. 
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Chukanov, N. V., Siidra, O. I., Polekhovsky, Y. S., Pekov, I. V., Varlamov, D. A., Ermolaeva, V. N., and Virus, A. A.: Erikjonssonite, (Pb32O21) [(V, Si, Mo, As)O4]4Cl9, a new mineral from the Kombat mine and structural classification of layered lead oxychlorides related to litharge, Eur. J. Mineral., 31, 619–628,, 2019. 
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.