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Figure 2
Langbeinite. (a) Atomic arrangement within the unit cell. (b) Atomic labels and ADP ellipsoids for atoms/ions defining the independent part of the unit cell (orange lines depict threefold axes). (c) Visualization of the polyhedral model of the langbeinite structure: SO4, MgO6 and KO12 polyhedra and the local neighbourhood of oxygen atoms/ions. The Wyckoff positions of K and Mg cations are a3. Other ions are placed at general positions. (d) Separated polyhedral of particular ions. (e) Local neighbourhood of oxygen ions/atoms.

IUCrJ
Volume 9| Part 1| January 2022| Pages 146-162
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521012628