The structure of kaliophilite KAlSiO4, a long-lasting crystallographic problem

Mugnaioli, E.; Bonaccorsi, E.; Lanza, A.E.; Elkaim, E.; Diez-Gómez, V.; Sobrados, I.; Gemmi, M.; Gregorkiewitz, M.

doi:10.1107/S2052252520012270

Figure 2
(a) SAED patterns of kaliophilite from Pollena (Vesuvius, Naples, Italy), with zone axis [001]. The reciprocal cell of kaliophilite is sketched in white, whereas the reciprocal vectors corresponding to the 15.6 Å periodicity are represented in gray. In (b) the corresponding HRTEM image is shown. The arrow indicates a slab with apparent 15.6 Å periodicity within the kaliophilite crystal. Other defects are also visible [modified from Bonaccorsi (1988