data_global _chemical_name_mineral 'Bridgmanite' loop_ _publ_author_name 'Ross N L' 'Hazen R M' _journal_name_full 'Physics and Chemistry of Minerals' _journal_volume 17 _journal_year 1990 _journal_page_first 228 _journal_page_last 237 _publ_section_title ; High-pressure crystal chemistry of MgSiO3 perovskite Sample: P = 2.2 GPa ; _database_code_amcsd 0007485 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Mg Si O3' _cell_length_a 4.762 _cell_length_b 4.918 _cell_length_c 6.8767 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 161.049 _exptl_crystal_density_diffrn 4.140 _symmetry_space_group_name_H-M 'P b n m' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,y,1/2-z' '-x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '1/2-x,1/2+y,1/2-z' '1/2-x,1/2+y,z' '1/2+x,1/2-y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Mg 0.51550 0.55730 0.25000 0.00912 Si 0.50000 0.00000 0.50000 0.00469 O1 0.10070 0.46370 0.25000 0.00975 O2 0.19790 0.20260 0.55240 0.00557