학술논문
Cation ordering in welinite crystals from the Yamada mine, Mie Prefecture, Japan / 三重県山田鉱山産ウエリン石の長周期構造
Document Type
Journal Article
Author
Source
Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences. 2018, :34
Subject
Language
Japanese
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.