著者

永嶌 真理子

出版者

日本結晶学会

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.54, no.5, pp.255-262, 2012-10-31 (Released:2012-11-06)

参考文献数

40

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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.