Articles | Volume 36, issue 5
https://doi.org/10.5194/ejm-36-797-2024
https://doi.org/10.5194/ejm-36-797-2024
Research article
 | 
12 Sep 2024
Research article |  | 12 Sep 2024

Crystal chemistry of K-tourmalines from the Kumdy-Kol microdiamond deposit, Kokchetav Massif, Kazakhstan

Beatrice Celata, Ferdinando Bosi, Kira A. Musiyachenko, Andrey V. Korsakov, and Giovanni B. Andreozzi

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Cited articles

Bačík, P. and Fridrichová, J.: Cation partitioning among crystallographic sites based on bond-length constraints in tourmaline-supergroup minerals, Am. Mineral., 106, 851–861, 2021. 
Bačík, P., Uher, P., Sykora, M., and Lipka, J.: Low-Al tourmalines of the schorl – dravite – povondraite series in redeposited tourmalinites from the Western Carpathians, Slovakia, Canad. Mineral., 46, 1117–1129, 2008. 
Balić-Žunić, T.: Use of three-dimensional parameters in the analysis of crystal structures under compression, in: Pressure-Induced Phase Transitions, edited by: Grzechnik, A., Transworld Research Network, Trivandrum, Kerela, India, 157–184, 2007. 
Balić-Žunić, T. and Makovicky, E.: Determination of the Centroid or “the Best Centre” of a Coordination Polyhedron, Acta Crystallogr. B, 52, 78–81, 1996. 
Barton Jr., R.: Refinement of the crystal structure of buergerite and the absolute orientation of tourmalines, Acta Crystallogr. B, 25, 1524–1533, 1969. 
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Short summary
The discovery of the K-dominant tourmaline maruyamaite with microdiamond inclusions suggested its ultrahigh-pressure formation. We analyzed the role of K in the tourmaline structure, with a special focus on its stability. High pressure is necessary to squeeze the large cation K+ in the stiff framework of tourmaline, although K is the underdog component if Na+ is present in the mineralizing fluid. K-tourmaline is stable at high pressure, overcoming the stereotype of a mere crustal component.
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