YbO Wyckoff R W G Crystal Structures 1 (1963) 85-237 Second edition. Interscience Publishers, New York, New York rocksalt structure _database_code_amcsd 0011450 4.86 4.86 4.86 90 90 90 Fm3m atom x y z Yb 0 0 0 O .5 .5 .5