Abstract. We study the bulk terminations in a model of icosahedral quasicrystals of an F-phase. The model is based on an icosahedral tiling, projected from the D₆ root-lattice. We compare the 5fold bulk terminations to the experimentally investigated surface of quasicrystals. Among other results, we are able to conclude that the Bergman and the Mackay polyhedra, that perform a decoration of the icosahedral tiling in the model, cannot be energetically stable constituents, i.e. the clusters.

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