Origin of low-symmetry growth sectors in edingtonite and yugawaralite, and crystal structure of the k{011} and v{120} sectors of yugawaralite
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dc.contributor.author | Tanaka T. | |
dc.contributor.author | Kimura R. | |
dc.contributor.author | Akizuki M. | |
dc.contributor.author | Kudoh Y. | |
dc.date.accessioned | 2021-10-14T07:45:23Z | |
dc.date.available | 2021-10-14T07:45:23Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=14291553 | |
dc.identifier.citation | Mineralogical Magazine, 2002, 66, 3, 409-420 | |
dc.identifier.issn | 0026-461X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/30693 | |
dc.description.abstract | Edingtonite and yugawaralite showing sectoral textures were studied by polarized optical microscopy and X-ray analysis. In edingtonite, the m{110} sector (2Vα = 22°) is optically triclinic and the c{001} sector (2Vα = 52°) is orthorhombic. In yugawaralite, the k{011} sector is optically monoclinic, whereas the v{120} sector is triclinic. Their crystal structures were determined. The results of refinement showed that the space groups of the k{011} (Rw = 4.5%) and v{120} (Rw = 5.1%) growth sectors are monoclinic Pc and triclinic P 1, respectively. In the v{120} sector, several interatomic distances, bond angles and site occupancies are different with respect to a symmetrical plane of the structure, and therefore the monoclinic c glide is extinct. Thus, the X-ray symmetry correlates with the optical one. From the relationship between the surface and internal texture, the symmetry and sector can be explained by cation (Al/Si) ordering during non-equilibrium crystal growth. | |
dc.title | Origin of low-symmetry growth sectors in edingtonite and yugawaralite, and crystal structure of the k{011} and v{120} sectors of yugawaralite | |
dc.type | Статья |
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