Articles | Volume 34, issue 5
Eur. J. Mineral., 34, 425–438, 2022
Eur. J. Mineral., 34, 425–438, 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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Cited articles

Andrade, M. B., Doell, D., Downs, R., and Yang, H.: Redetermination of katayamalite, KLi3Ca7Ti2(SiO3)12(OH)2, Acta Cryst., E69, i41,, 2013. 
Armbruster, T. and Oberhänsli, R.: Crystal chemistry of double-ring silicates: structures of sugilite and brannockite, Amer. Miner., 73, 595–600, 1988. 
Brown, I. D. and Altermatt, D.: Bond-valence parameters obtained from a systematic analysis of the inorganic crystal structure database, Acta Cryst., B41, 244–247,, 1985. 
Burns, R. G. and Law, A. D.: Hydroxyl stretching frequencies in the infrared spectra of anthophyllites and gedrites, Nature, 226, 73–75,, 1970. 
Cámara, F. and Oberti. R.: The crystal-chemistry of holmquistites: Ferroholmquistite from Greenbushes (Western Australia) and hints for compositional constraints in BLi amphiboles, Amer. Miner., 90, 1167–1176,, 2005. 
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.