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

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 Fe_0.126³⁺ Mn _{0.052 )5.049} (Na_1.425Ca_0.348Sr_0.297) _2.07K_0.873Si_8.048O₂₂(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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