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Figure 3
An average structure model of mullite with split sites and its decomposition into diclusters and triclusters. Unit-cell borders are marked by black lines. The fractional occupancy of each site is indicated by the filling of the sphere that represents the atom. A vacancy requires that all cation sites with black labels and the central oxygen sites are simultaneously vacant, and that two triclusters are present next to it, as shown on the left-hand side of the model.

IUCrJ
Volume 5| Part 4| July 2018| Pages 497-509
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518007467