10. Summary of Crystal-Chemical Data for the Observed Structure Types.

structure type	crystal system	Wyckoff position (M)	site symmetry	C.N.(M):
NaSbF6 [127]	cubic	4b	3̅.	6
KSbF6 [134]	cubic	8b	.3̅.	6
KPF6 [128]	cubic	4b	m3̅m	-
CsPF6 [137]	cubic	4a	m3̅m	-
Ca□B6 [138]	cubic	1b	m3̅m	6
KAsF6 [130]	trigonal	3b	3̅.	12
LiSbF6 [89]	trigonal	3b	3̅.	6
KNbF6 [132]	tetragonal	2c	4̅..	8
KUF6	monoclinic	4h	2	10

^aDisordered structures.

^bSingle-crystal studies of this work.