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 = 1 atm, in P-cell ; _database_code_amcsd 0000566 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Fe2 Si O4' _cell_length_a 4.818 _cell_length_b 10.470 _cell_length_c 6.086 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 307.005 _exptl_crystal_density_diffrn 4.409 _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 0.00342 Fe2 0.98500 0.27900 0.25000 0.00342 Si 0.42600 0.09500 0.25000 0.00038 O1 0.77200 0.09800 0.25000 ? O2 0.21600 0.45000 0.25000 -0.00127 O3 0.28100 0.16400 0.04200 0.00253