European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 38, issue 2
Articles | Volume 38, issue 2
https://doi.org/10.5194/ejm-38-169-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-38-169-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 38, issue 2
New minerals, nomenclature, and classification
 | 
02 Apr 2026
New minerals, nomenclature, and classification |  | 02 Apr 2026

Friisite, Pb8Al3Si8O27Cl3, a new mineral with a polysomatic relation to jagoite, from Långban, Sweden

Dan Holtstam, Fernando Cámara, and Andreas Karlsson

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Short summary
Friisite is a newly identified mineral, with the chemical formula Pb8Al3Si8O27Cl3, from the Långban mine in Sweden, found as tiny, white, flaky grains within a skarn matrix alongside jagoite and other silicates. It has a sub-adamantine luster, perfect basal cleavage, a hardness of 4–5, and a high density of 5.54 g cm−³. Structurally it is a hexagonal phyllosilicate, closely related to jagoite in a polysomatic series. The mineral is named in honor of Danish mineralogist Henrik Friis.
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