Villiaumite
Bragg W
Nature 105 (1920) 646-648
Crystal structure of Na F
_cod_database_code 1011282
_database_code_amcsd 0018133
4.78 4.78 4.78 90 90 90 Fm3m
atom  x  y  z
Na1   0  0  0
F1   .5 .5 .5