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 = 5.0 GPa ; _database_code_amcsd 0007486 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Mg Si O3' _cell_length_a 4.746 _cell_length_b 4.899 _cell_length_c 6.8538 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 159.355 _exptl_crystal_density_diffrn 4.184 _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 0.51510 0.55580 0.25000 0.01026 Si 0.50000 0.00000 0.50000 0.00646 O1 0.10190 0.46270 0.25000 0.01102 O2 0.19760 0.20140 0.55180 0.00519