Oxygen Schiferl D, Cromer D T, Schwalbe L A, Mills R L Acta Crystallographica B39 (1983) 153-157 Structure of 'Orange' 18O2 at 9.6 GPa and 297 K Locality: Synthetic _database_code_amcsd 0020615 4.2151 2.9567 6.6897 90 90 90 Fmmm atom x y z O 0 0 .0871