Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2017 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : R2-P07
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Host: Japan Association of Mineralogical Sciences

R2: Crystal structure, crystal chemistry, physical properties of minerals, crystal growth and applied mineralogy
Structural change by Ca-Sr substitution in synthetic (Ca,Sr)2Fe3+AlSiO7-melilite
*Anzu Oguro, Maki Hamada, Masahide Akasaka, Hiroki Okudera, Masayuki Okuno
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Keywords: Synthetic Sr-Fe-melilite, Ionic substitution, Structural change
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Abstract
Synthetic [Sr2Fe3+AlSiO7 (SFG)]100- and SFG50[Ca2Fe3+AlSiO7 (CFG)]50- melilites were investigated to examine an effect of ionic substitutions at 8-coordinated site (W site) on crystal structure of melilite. It is indicated by the refined crystal structure that Fe3+ is distributed at two tetrahedral sites. The Sr-Ca substitution at the W site causes expansion of WO8 polyhedra and increase of mainly c dimension. Due to the T1O4- and T2O4-tetrahedra share apexes or edges with WO8 polyhedra, the tetrahedral sites are influenced by the geometric change of the WO8 polyhedra.
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© 2017 Japan Association of Mineralogical Sciences
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Abstracts of Papers Presented at the Annual Meeting of The Japanese Association of Mineralogists, Petrologists and Economic Geologists

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