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The crystal chemistry of the gedrite-group amphiboles. I. Crystal structure and site populations

Published online by Cambridge University Press:  05 July 2018

M. Schindler ,
E. Sokolova ,
Y. Abdu ,
F. C. Hawthorne ,
B. W. Evans  and
K. Ishida
M. Schindler
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
E. Sokolova
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
Y. Abdu
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
F. C. Hawthorne*
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
B. W. Evans
Affiliation:
Department of Earth and Space Sciences, University of Washington, Box 351310, Seattle, Washington 98195, USA
K. Ishida
Affiliation:
Department of Evolution of Earth Environments, Graduate School of Social and Cultural Studies, Kyushu University, 4-2-1 Ropponmatsu, Chu-ku, Fukuoko 810-8560, Japan
*
*E-mail: frank_hawthorne@umanitoba.ca
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Abstract

The crystal structures of twenty-five orthorhombic Fe-Mg-Mn amphiboles, a = 18.525 – 18.620, b = 17.806-18.034, c = 5.264-5.303 Å, V = 1737.6-1776.7, space group = Pnma, Z = 4, have been refined to R indices in the range 2.1–7.8% using 790–1804 unique observed reflections measured with Mo-Kα X-radiation on a Bruker P4 automated four-circle diffractometer equipped with a 1K CCD detector. The quality of the refinements is strongly a function of the [4]Al content of the crystals because of unmixing in the central part of the series due to the presence of a low-temperature solvus. The amphibole crystals were analysed by electron microprobe subsequent to collection of the X-ray intensity data and span the anthophyllite-gedrite series from 0.17–1.82 [4]Al a.p.f.u. Mössbauer spectroscopy shows that the amphiboles of this series commonly contain small but significant amounts of Fe3+ . The amount of [4]Al is linearly related to the grand <T-O> distance by the equation <T-O> = 1.6214 + 0.171 [4]Al, R = 0.980; the slope of this relation is not significantly different from that characteristic of a hard-sphere model. The <T-O> distances indicate the following site preference for [4]Al: T1B > T2B > T1A » T2A. The <M2-O> distances are compatible with all [6]Al and Fe3+ ordered at the M2 site. The grand <M1,2,3 '3 –O> distance is related to the mean radius of the constituent cations, <rM1,2,3>, by the equation ≪M1,2,3-O≫ = 1.4684 + 0.8553(7) <rM1,2,3>.

Keywords

anthophyllitegedriteorthorhombic amphibolecrystal-structure refinementelectron-microprobe analysisMössbauer spectroscopysite populations
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 3 , June 2008 , pp. 703 - 730
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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