data_data_OPT_STEP_8 _cell_length_a 4.1942 _cell_length_b 4.1942 _cell_length_c 4.1942 _cell_angle_alpha 90.0000 _cell_angle_beta 90.0000 _cell_angle_gamma 90.0000 _cell_volume 73.78 _symmetry_cell_setting 'cubic' _symmetry_Int_Tables_number 225 _symmetry_space_group_name_H-M 'Fm-3m ' loop_ _atom_site_type_symbol _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy Mg MG1 0.00000 0.00000 0.00000 1.00000 O O2 0.50000 0.50000 0.50000 1.00000