data_global _chemical_name_mineral 'Forsterite' loop_ _publ_author_name 'Francis C A' 'Ribbe P H' _journal_name_full 'American Mineralogist' _journal_volume 65 _journal_year 1980 _journal_page_first 1263 _journal_page_last 1269 _publ_section_title ; The forsterite-tephroite series: I. Crystal structure refinements Sample: Fo51 olivine ; _database_code_amcsd 0000801 _chemical_compound_source 'Langban, Sweden' _chemical_formula_sum 'Mg1.03 Mn.97 Si O4' _cell_length_a 4.794 _cell_length_b 10.491 _cell_length_c 6.123 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 307.949 _exptl_crystal_density_diffrn 3.676 _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_occupancy Mg1 0.00000 0.00000 0.00000 1.00000 Mn2 0.98700 0.27900 0.25000 0.97000 Mg2 0.98700 0.27900 0.25000 0.03000 Si 0.42260 0.09100 0.25000 1.00000 O1 0.75850 0.08670 0.25000 1.00000 O2 0.23010 0.44890 0.25000 1.00000 O3 0.27820 0.15900 0.03740 1.00000 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 Mg1 0.00361 0.00753 0.00475 -0.00025 -0.00074 -0.00111 Mn2 0.00710 0.00647 0.00695 0.00061 0.00000 0.00000 Mg2 0.00710 0.00647 0.00695 0.00061 0.00000 0.00000 Si 0.00361 0.00535 0.00475 0.00000 0.00000 0.00000 O1 0.00256 0.00948 0.00703 -0.00051 0.00000 0.00000 O2 0.00466 0.00613 0.00722 -0.00127 0.00000 0.00000 O3 0.00454 0.00725 0.00684 0.00000 0.00000 0.00130