data_global _chemical_name_mineral 'Fayalite' loop_ _publ_author_name 'Hazen R M' _journal_name_full 'American Mineralogist' _journal_volume 62 _journal_year 1977 _journal_page_first 286 _journal_page_last 295 _publ_section_title ; Effects of temperature and pressure on the crystal structure of ferromagnesian olivine T = 23 deg C, P = 31 kb ; _database_code_amcsd 0000568 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Fe2 Si O4' _cell_length_a 4.802 _cell_length_b 10.260 _cell_length_c 6.070 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 299.060 _exptl_crystal_density_diffrn 4.526 _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 Fe1 0.00000 0.00000 0.00000 0.00380 Fe2 0.98700 0.28400 0.25000 0.00633 Si 0.42800 0.09200 0.25000 ? O1 0.77100 0.10700 0.25000 -0.01013 O2 0.23700 0.47900 0.25000 -0.01013 O3 0.31400 0.15900 0.04000 -0.00380