Average X—Sb—X angle for MSb(III)X structures (where M is an alkali metal, an alkaline earth metal or a transition metal, and X is O, S or Se) from the ICSD, depending on whether the SbX3 units are connected or isolated. To the left a box plot is shown with an orange bar marking the median value, the box marks the interquartile range and the whiskers mark the spread of the data points. To the right a histogram shows the number of SbX3 units (N) with bond angles within the given interval. Data are binned in 1° intervals. The search is based on 77 crystal structures with 137 unique connected SbX3 units and 35 unique isolated SbX3 units. See Table S2 for a list of structures and ICSD codes.