Villiaumite_6 Formula: Na F Name: Villiaumite Unit cell: 4.6726 4.6726 4.6726 90.0 90.0 90.0 , V=102.02 Space group: FM3M (225)
Deshpande V T , Acta Crystallographica , 14 (1961) p.794-794, Thermal expansion of sodium fluoride and sodium bromide, Note: T = 254 C, rocksalt structure