The Crystal Structure of Ramsdellite from Pirika Mine

Miura, Hiroyuki; Kudou, Haruhiko; Choi, Jai Ho; Hariya, Yu

The Crystal Structure of Ramsdellite from Pirika Mine

Miura, Hiroyuki; Kudou, Haruhiko; Choi, Jai Ho et al.

北海道大学理学部紀要, 1990, 22(4), 611-617

Permalink : https://hdl.handle.net/2115/36769

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アクセス権	open access
URI	https://hdl.handle.net/2115/36769
タイトル	The Crystal Structure of Ramsdellite from Pirika Mine
著者	Miura, Hiroyuki ; Kudou, Haruhiko ; Choi, Jai Ho ; Hariya, Yu
e-Rad_Researcher 70157436 著者名 Miura, Hiroyuki
著者名 Kudou, Haruhiko
著者名 Choi, Jai Ho
著者名 Hariya, Yu
言語	英語
発行日	1990-08
出版者	北海道大学
出版者	Hokkaido University
収録物名	北海道大学理学部紀要
収録物名	Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy
巻(号)	22(4)
ページ	611-617
抄録	Chemical composition and crystal structure of ramsdellite from Pirika mine, Hokkaido, Japan were studied. Chemical composition, determined by EPMA, shows that ramsdellite is pure manganese oxide and does not contain any other element. The crystallographic data, obtained by Rietveld analysis, indicate that ramsdellite has orthorhombic symmetry. Space group is Pnma and unit cell parameters are: a=4.513(1)Å, b=9.264(1)Å and c=2.859(1)Å. The structure consists of MnO6 double chains (Byström, 1950). There are 4 symmetry-dependent MnO6 octahedral in an unit cell and 2 symmetry-independent oxygen atoms in an MnO6 octahedron. The difference of inter-atomic distances between Mn-O(1) and Mn-O(2) is larger than other manganese dioxide minerals. The distortion of MnO6 octahedron is quite similar to that of groutite (α-MnOOH). These data suggest that ramsdellite was formed by oxidation of groutite.
資源タイプ	紀要論文
出版タイプ	Version of Record
PISSN	0018-3474