data_global _chemical_name_mineral 'Fayalite' loop_ _publ_author_name 'Smyth J R' 'Hazen R M' _journal_name_full 'American Mineralogist' _journal_volume 58 _journal_year 1973 _journal_page_first 588 _journal_page_last 593 _publ_section_title ; The crystal structures of forsterite and hortonolite at several temperatures up to 900 C Note: variety hortonolite T = 900 C ; _database_code_amcsd 0000335 _chemical_compound_source 'Franklin, New Jersey, USA' _chemical_formula_sum '(Fe1.1 Mg.75 Mn.15) Si O4' _cell_length_a 4.899 _cell_length_b 10.419 _cell_length_c 6.080 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 310.340 _exptl_crystal_density_diffrn 3.852 _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 _atom_site_U_iso_or_equiv Fe1 0.00000 0.00000 0.00000 0.56400 0.01292 Mg1 0.00000 0.00000 0.00000 0.35900 0.01292 Mn1 0.00000 0.00000 0.00000 0.07700 0.01292 Fe2 0.98760 0.27970 0.25000 0.53600 0.01026 Mg2 0.98760 0.27970 0.25000 0.39100 0.01026 Mn2 0.98760 0.27970 0.25000 0.07300 0.01026 Si 0.42840 0.09570 0.25000 1.00000 0.00874 O1 0.76490 0.09210 0.25000 1.00000 0.01241 O2 0.21350 0.45240 0.25000 1.00000 0.01153 O3 0.28470 0.16310 0.03750 1.00000 0.01317