On the symmetry of optically isotropic modulated lazurites from the Baikal region
| Autor: | Andreas Schönleber, N. B. Bolotina, A. A. Kashaev, Gervais Chapuis, A. N. Sapozhnikov, Ramiza K. Rastsvetaeva |
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| Předmět: |
Physics
crystal structure business.industry aluminosilicates Space group lazurites Crystal structure twins Condensed Matter Physics Electronic Optical and Magnetic Materials Crystal Crystallography Optics modulated crystals visual_art X-ray crystallography visual_art.visual_art_medium x-ray analysis Orthorhombic crystal system Symmetry (geometry) business Crystal twinning Lazurite |
| Popis: | The incommensurately modulated twinned crystal structure of lazurite from the Baikal region is presented for the first time. The orthorhombic structure was solved in a pseudo cubic unit cell, a(cub) = 9.077(1) Angstrom, and in the (3 + 2)D superspace group Pnn2(alphaalpha0, alpha - alpha0). The crystal is twinned with three components oriented along the [111] axis. In order to include all the measured satellites, the structure was also refined with trigonal symmetry R3, where the average structure refined to R = 3.6%. A 3D-modulated twinned trigonal structure will be further considered. |
| Databáze: | OpenAIRE |
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