The low-temperature triclinic variety -BaZr 2 F 10 constitutes a new structure type, less symmetrical than the higher-temperature -variety. It is based on the stacking of double sheets of Zr polyhedra, connecting three different kinds of ZrF 7 polyhedra and one ZrF 8 polyhedron via vertices and edges, separated by corrugated Ba 2+ layers. It is compared to the high-temperature -variety, directly recrystallizing from barium fluoridozirconate glass, and also to BaTe 2 F 10 and KTe 2 F 9 .