三重県山田鉱山産ウエリン石の長周期構造

門馬 綱一; 浜根 大輔; Mills Stuart; 下林 典正; 宮脇 律郎; 稲葉 幸郎

doi:10.14824/jakoka.2018.0_34

2018 Annual Meeting of Japan Association of Mineralogical Sciences

Session ID : R1-10

DOI https://doi.org/10.14824/jakoka.2018.0_34

Conference information

Host: Japan Association of Mineralogical Sciences

R1: Characterization and description of minerals

Cation ordering in welinite crystals from the Yamada mine, Mie Prefecture, Japan

*Koichi Momma, Daisuke Nishio Hamane, Stuart Mills, Norimasa Shimobayashi, Ritsuro Miyawaki, Sachio Inaba

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Keywords: welinite, cation ordering, superstructure, silicate

CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract

We found welinite from Yamada mine, Mie Prefecture, Japan. Welinite was originally discovered from Langban, Sweden, and its crystal structure was solved in P6₃or its sub-group P3 with a = 8.155 and c = 4.785 A, and an ideal formula of Mn²⁺₆(W⁶⁺,Mg)₂(SiO₄)₂(O,OH)₆. On the other hand, the welinite crystals from Yamada mine have a √3 × 3 superstructure with a = 14.074(3) and c = 14.455(3) A, and space group R3. The long-rangeordering of W sites and vacancies causes the superstructure.

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