E. V. Sokolova, Yu. K. Kabalov, C. McCammon, J. Schneider, A. A. Konev; Cation partitioning in an unusual strontian potassicrichterite from Siberia: Rietveld structure refinement and Mössbauer spectroscopy. Mineralogical Magazine ; 64 (1): 19–23. doi:
Download citation file:
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 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).