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1 Department of Crystallography and Crystal Chemistry, Faculty of Geology, Moscow State University, Vorob’evy Gory, Moscow 119899, Russia
2 Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth D-95440, Germany
3 Institute für Kristallographie und Angewandte Mineralogie, Universität München, Theresienstraße 41, München D-80333, Germany
4 Institute of Earth’s Crust, Russian Academy of Sciences, Lermontova St. 128, Irkutsk 664033, Russia
* E-mail: evsok{at}geol.msu.ru
The crystal structure of strontian potassicrichterite (Mg 4.871 Fe0.1263+ Mn 0.052 )
5.049 (Na1.425Ca0.348Sr0.297) 2.07K0.873Si8.048O22(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 ß = 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: richterite, amphibole, crystal structure, Rietveld refinement, Mössbauer spectroscopy, Murun alkaline massif, Siberia
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