Articles | Volume 37, issue 1
https://doi.org/10.5194/ejm-37-79-2025
https://doi.org/10.5194/ejm-37-79-2025
New minerals, nomenclature, and classification
 | 
13 Feb 2025
New minerals, nomenclature, and classification |  | 13 Feb 2025

Heimaeyite, Na3Al(SO4)3, a new mineral from the fumaroles on Eldfell volcano, Iceland

Tonči Balić-Žunić, Anna Garavelli, Donatella Mitolo, Fabrizio Nestola, Martha Giovanna Pamato, Maja Bar Rasmussen, and Morten Bjerkvig Jølnæs

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Cited articles

Balić Žunić, T. and Vicković, I.: IVTON – Program for the Calculation of Geometrical Aspects of Crystal Structures and Some Crystal Chemical Applications, J. Appl. Crystallogr., 29, 305–306, 1996. 
Balić-Žunić T., Garavelli A., Acquafredda P., Leonardsen E., and Jakobsson S. P.: Eldfellite, NaFe(SO4)2, a new fumarolic mineral from Eldfell volcano, Iceland, Mineral. Mag., 73, 51–57, https://doi.org/10.1180/minmag.2009.073.1.51, 2009. 
Bosi, F., Hatert, F., Pasero, M., and Mills, S. J.: IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 81, Eur. J. Mineral., 36, 917–923, https://doi.org/10.5194/ejm-36-917-2024, 2024. 
Boghosian, S., Fehrmann, R., and Nielsen, K.: Synthesis and crystal structure of Na3V(SO4)3. Spectroscopic characterisation of Na3V(SO4)3 and NaV(SO4)2, Acta Chem. Scand., 48, 724–731, 1994. 
Borup, F., Berg, R. W., and Nielsen, K.: The crystal structure of K7Nb(SO4)6 and K7Ta(SO4)6, Acta Chem. Scand., 44, 328–331, 1990. 
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Short summary
Heimaeyite (Na3Al(SO4)3) has been found in fumaroles on Eldfell volcano, which lies on the island of Heimaey, Iceland. Its crystal structure contains Al–sulfate chains and belongs to a known structure type that also comprises K–Nb, K–Ta, Na–V, and Na–Fe representatives. We registered small Fe–Al substitution in heimaeyite, which might indicate a solid solution between Na–Al and Na–Fe compounds. We investigated the specimen with electron microscopy, an electron microprobe, and X-ray diffraction.
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