Abstract
Four macroscopically visible B–E (rim) zones of the natural grossular-andradite garnet with Grs 58 –64 Adr 36 –42 Sps 2 composition were crystallographically studied. The applied procedure includes the Rietveld refinements of the crystal structures in a series of six space groups, which were followed by the comparative analysis of the R -values, site occupancy factors, and the bond lengths and angles. It was established that it crystallized in the rhombohedral R ‾ 3 c space group. Various polyhedral distortions and structural order-disorder variations between the studied zones were also observed, determined and discussed. Therefore, rhombohedral symmetry of the studied grandite could be treated as primary and residual strain as the second cause for its slight optical anisotropy.
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