or GaPO4 zeotypes where fluoride anions are encapsulated in the d4r cages. Clearly, the lack of long-range ordering in real systems will hamper a detection of such bonding scenarios with (powder) diffraction methods, as the occupancy of the fourfold-disordered F position would only amount to 0.25. The highly dynamic behaviour at room temperature might render it difficult to detect Al-F/Ga-F bonds with solid-state NMR methods, but investigations at cryogenic temperatures could provide more insights. Furthermore, it could be interesting to assess whether the presence of these bonds should give rise to distinct signals in the vibrational spectra, which could possibly serve as "fingerprints". In any event, the partly unexpected findings of the present study show that it should be worthwhile to revisit these zeotypes with state-of-the-art experimental methods.