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Effect of chlorine on the crystal structure of a chlorine-rich hastingsite

Published online by Cambridge University Press:  05 July 2018

Kuniaki Makino ,
Katsutoshi Tomita  and
Kanenori Suwa
Kuniaki Makino
Affiliation:
Department of Geology and Mineralogy, Faculty of Science, Kyoto University, Kyoto 606, Japan
Katsutoshi Tomita
Affiliation:
Department of Geology and Mineralogy, Faculty of Science, Kyoto University, Kyoto 606, Japan
Kanenori Suwa
Affiliation:
Department of Earth Sciences, Faculty of Science, Nagoya University, Nagoya 464-01, Japan
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Abstract

The structure refinement of a hastingsite (Cl 0.91 p.f .u.) from West Ongul Island, Ltitzow-Holm Bay, East Antarctica, has been carried out in order to characterise the effect of CI on the crystal structure. The composition of the Cl-rich hastingsite is K0.69Na0.26Ca1.99Mg1.09Fe2+2.71Fe3+0.92Mn0.04Ti0.10−Al2.31Si5.83O22OH0.99Cl0.91F0.10 with unit cell parameters a 9.962(3), b 18.283(7), c 5.572(1) Å and β 104.87(3)°.

In the Cl-rich hastingsite, A1, Fe3+ and Ti occupy only the M(2) site, and Fe2+ strongly prefers the M(1) and M(3) sites to the M(2) site with respect to Mg. The Mg-Fe2+ distribution suggests that the Mg-CI avoidance is realised in the intracrystalline exchange reaction among the octahedral sites in the Cl-rich hastingsite. The individual position of CI and OH was refined and the effective ionic radius of Cl in fourfold coordination is determined as 1.79 Å. Substitution of Cl for OH expands the sizes of the M(1) and M(3) sites and extends the double chains in comparison with hydroxy calcic amphiboles. Cl especially, is close to the 0(6) and 0(7) oxygens beyond the minimum distance calculated from effective ionic radii. Therefore, the Cl-rich hastingsite is considered to be deformed locally by Cl.

Keywords

Cl-rich hastingsitestructure refinementchlorine effectamphibole
Type
Mineralogy
Information
Mineralogical Magazine , Volume 57 , Issue 389 , December 1993 , pp. 677 - 685
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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