Articles | Volume 34, issue 5
Eur. J. Mineral., 34, 425–438, 2022
https://doi.org/10.5194/ejm-34-425-2022
Eur. J. Mineral., 34, 425–438, 2022
https://doi.org/10.5194/ejm-34-425-2022
Research article
07 Oct 2022
Research article | 07 Oct 2022

Ferro-ferri-holmquistite, Li2(Fe2+3Fe3+2)Si8O22(OH)2, Fe2+Fe3+ analogue of holmquistite, from the Iwagi islet, Ehime, Japan

Mariko Nagashima et al.

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Short summary
Ferro-ferri-holmquistite (IMA2022-020), ideal formula ☐Li2(Fe32+Fe23+)Si8O22(OH)2, was found in albitized granite from the Iwagi islet, Ehime, Japan. It is a Fe2+Fe3+ analogue of holmquistite and belongs to the lithium subgroup amphiboles. Ferro-ferri-holmquistite occurs as blue acicular crystals typically replacing the biotite and is the product of metasomatic mineral replacement reactions by dissolution–reprecipitation processes associated with Na- and Li-rich hydrothermal fluids.