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Cation partitioning in an unusual strontian potassicrichterite from Siberia: Rietveld structure refinement and Mössbauer spectroscopy

Published online by Cambridge University Press:  25 June 2018

E. V. Sokolova ,
Yu. K. Kabalov ,
C. McCammon ,
J. Schneider  and
A. A. Konev
E. V. Sokolova*
Affiliation:
Department of Crystallography and Crystal Chemistry, Faculty of Geology, Moscow State University, Vorob’evy Gory, Moscow 119899, Russia
Yu. K. Kabalov
Affiliation:
Department of Crystallography and Crystal Chemistry, Faculty of Geology, Moscow State University, Vorob’evy Gory, Moscow 119899, Russia
C. McCammon
Affiliation:
Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth D-95440, Germany
J. Schneider
Affiliation:
Institute für Kristallographie und Angewandte Mineralogie, Universität München, Theresienstraβe 41, München D-80333, Germany
A. A. Konev
Affiliation:
Institute of Earth’s Crust, Russian Academy of Sciences, Lermontova St. 128, Irkutsk 664033, Russia
*
*E-mail: evsok@geol.msu.ru
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Abstract

The crystal structure of strontian potassicrichterite (Mg4.871Fe0.1263+ Mn0.052)Σ5.049(Na1.425Ca0.348Sr0.297)σ2.07K0.873Si8.048O22(OH)2.15 – an unusual amphibole containing up to 3.7 wt.% SrO from the Murun alkaline massif, Eastern Siberia has been refined from X-ray powder diffraction data in monoclinic space group C2/m, with a = 10.0325(1) Å, b = 17.977(1) Å, c = 5.2698(1) Å, and β = 104.70(1)°. According to Mössbauer spectroscopy, nearly all iron occurs as Fe3+ in octahedral coordination. Rietveld refinement shows the Fe3+ to be ordered onto the M(2) site. Sr is completely ordered onto M(4).

Keywords

richteriteamphibolecrystal structureRietveld refinementMössbauer spectroscopyMurun alkaline massifSiberia
Type
Research Article
Information
Mineralogical Magazine , Volume 64 , Issue 1 , February 2000 , pp. 19 - 23
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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