Crystal Chemistry of Epidote-Group Minerals: New and Further Issues

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  • NAGASHIMA Mariko
    Department of Earth Science, Graduate School of Science and Engineering, Yamaguchi University

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  • 緑簾石族鉱物の結晶化学：解析と合成による新たな展開
  • リョク スダレセキゾク コウブツ ノ ケッショウ カガク : カイセキ ト ゴウセイ ニ ヨル アラタ ナ テンカイ

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Epidote-group minerals are important rock-forming minerals and play a role as a reservoir of transition metal elements, strontium, rare-earth elements and water. They are formed under a variety of geological conditions. Both natural epidotes with complex chemical compositions and synthetic ones with idealized compositions have been investigated to understand their chemico-crystallographical features. In this paper, recent studies on synthetic and natural monoclinic epidotes are reviewed in terms of distributions of cations in coordination polyhedra and structural variations due to cation substitutions. New circumstances such as ‘ghost’ difference Fourier peak as an index of low-crystallinity epidotes and OH-free structure (oxyallanite) are introduced, and subjects for the future studies are proposed.

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