Articles | Volume 36, issue 1
https://doi.org/10.5194/ejm-36-247-2024
https://doi.org/10.5194/ejm-36-247-2024
Research article
 | 
01 Mar 2024
Research article |  | 01 Mar 2024

Crystal chemistry and molar volume of potassic-chloro-hastingsite

Jared P. Matteucci, David M. Jenkins, and M. Darby Dyar

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Cited articles

Angel, R. J.: High-pressure structure of anorthite, Am. Mineral., 73, 1114–1119, 1988. 
Barnes, J. D. and Cisneros, M.: Mineralogical control on the chlorine isotope composition of altered oceanic crust, Chem. Geol., 326–327, 51–60, 2012. 
Castelli, D.: Chlorpotassium ferro-pargasite from Sesia-Lanzo marbles (Western Italian Alps): a record of highly saline fluids, Soc. Italiana Mineral. Petrol., 43, 129–138, 1988. 
Cuadros, J., Michalski, J. R., Dyar, M. D., and Dekov, V.: Controls on tetrahedral Fe(III) abundance in 2:1 phyllosilicates, Am. Mineral., 104, 1608–1619, 2019. 
Driscall, J., Jenkins, D. M., Dyar, M. D., and Bozhilov, K. N.: Cation ordering in synthetic low-calcium actinolite, Am. Mineral., 90, 900–911, 2005. 
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Short summary
To explore the compositional constraints on Cl incorporation into amphiboles, which can be used to characterize transient brines, amphiboles were synthesized with a broad range of Cl concentrations. Amphibole Cl was found to be dependent on the Fe2+,3+ content, but not the tetrahedral Al content or K / Na ratio. Cl incorporation was found to contract the unit cell along a and expand it along b and c. Molar volumes were derived for endmember Cl-amphiboles using multivariate regressions.