European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 37, issue 2
Articles | Volume 37, issue 2
https://doi.org/10.5194/ejm-37-221-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/ejm-37-221-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 37, issue 2
Research article
 | 
26 Mar 2025
Research article |  | 26 Mar 2025

The fate of an old Mn–Fe amphibole species: description of clino-ferro-suenoite, □Mn2Fe2+5Si8O22(OH)2

Dan Holtstam, Fernando Cámara, Henrik Skogby, Andreas Karlsson, and Alessandro De Leo

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Short summary
The mineral clino-ferro-suenoite, with the chemical formula ◻Mn2Fe2+5Si8O22(OH)2, was historically named “dannemorite” or “manganogrunerite” and is a member of the amphibole supergroup.  It is now formally approved by the International Mineralogical Association. It occurs in iron–manganese-bearing rock from the Hilläng mines, Dalarna, Sweden, and is associated with the minerals fayalite, spessartine, ferro-actinolite, calcite, magnetite and pyrite. It formed by replacement of Mn-bearing fayalite.
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