Na2Se Wyckoff R W G Crystal Structures 1 (1963) 239-444 Second edition. Interscience Publishers, New York, New York Anti-fluorite structure _database_code_amcsd 0011744 6.809 6.809 6.809 90 90 90 Fm3m atom x y z Na .25 .25 .25 Se 0 0 0