Beryllium Larsen F K, Hansen N K Acta Crystallographica B40 (1984) 169-179 Diffraction study of the electron density distribution in beryllium metal Locality: Synthetic _database_code_amcsd 0020596 2.2853 2.2853 3.5842 90 90 120 P6_3/mmc atom x y z Be 1/3 2/3 .25