Note: The cation is normally at the center of the polyhedron. This model uses fluorine at the center of the tetrahedron and calcium at the vertices. (The calcium coordination is cubic and cubes are not part of this kit.)

Materials with the same crystal structure include AuAl₂, AuGa₂, AuIn₂, AuSb₂, BaCl₂, BaF₂, Be₂B, Be₂C, CaF₂, CdF₂, CoSi₂, GeMg₂, HfO₂, HgF₂, IrSn₂, Ir₂P, K₂O, K₂S, K₂Se, K₂Te, Li₂O, Li₂S, Li₂Se, Li₂Te, Na₂O, Na₂S, Na₂Se, Na₂Te, NbH₂, NiSi₂, β-PbF₂, PbMg₂, α-PoO₂, PtAl₂, PtGa₂, PtIn₂, PtSn₂, RaF₂, Rb₂O, Rb₂S, Rb₂P, ScH₂, SiMg₂, SmH₂, SnMg₂, SrCl₂, SrF₂, YH₂, and ZrO₂.