data_global _chemical_name_mineral 'Bromellite' loop_ _publ_author_name 'Hazen R M' 'Finger L W' _journal_name_full 'Journal of Applied Physics' _journal_volume 59 _journal_year 1986 _journal_page_first 3728 _journal_page_last 3733 _publ_section_title ; High-pressure and high-temperature crystal chemistry of beryllium oxide Note: P = 4.0 GPa ; _database_code_amcsd 0019183 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Be O' _cell_length_a 2.6825 _cell_length_b 2.6825 _cell_length_c 4.3525 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 27.124 _exptl_crystal_density_diffrn 3.062 _symmetry_space_group_name_H-M 'P 63 m c' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,-x+y,1/2+z' 'x-y,x,1/2+z' '-y,-x,z' '-y,x-y,z' 'x-y,-y,1/2+z' '-x,-y,1/2+z' 'x,x-y,z' '-x+y,-x,z' 'y,x,1/2+z' 'y,-x+y,1/2+z' '-x+y,y,z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Be 0.33333 0.66667 0.00000 0.00747 O 0.33333 0.66667 0.37990 0.00355