data_global _chemical_name_mineral 'Fayalite' loop_ _publ_author_name 'Birle J D' 'Gibbs G V' 'Moore P B' 'Smith J V' _journal_name_full 'American Mineralogist' _journal_volume 53 _journal_year 1968 _journal_page_first 807 _journal_page_last 824 _publ_section_title ; Crystal structures of natural olivines Note: variety hortonolite ; _database_code_amcsd 0000174 _chemical_formula_sum '(Mg.98 Fe.98 Mn.02 Ca.02) Si O4' _cell_length_a 4.787 _cell_length_b 10.341 _cell_length_c 6.044 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 299.192 _exptl_crystal_density_diffrn 3.830 _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 Mg1 0.00000 0.00000 0.00000 0.49000 0.00456 Fe1 0.00000 0.00000 0.00000 0.49000 0.00456 Mn1 0.00000 0.00000 0.00000 0.01000 0.00456 Ca1 0.00000 0.00000 0.00000 0.01000 0.00456 Mg2 0.98678 0.27915 0.25000 0.49000 0.00595 Fe2 0.98678 0.27915 0.25000 0.49000 0.00595 Mn2 0.98678 0.27915 0.25000 0.01000 0.00595 Ca2 0.98678 0.27915 0.25000 0.01000 0.00595 Si 0.42870 0.09576 0.25000 1.00000 0.00228 O1 0.76844 0.09173 0.25000 1.00000 0.00355 O2 0.21419 0.44958 0.25000 1.00000 0.00228 O3 0.28401 0.16395 0.03442 1.00000 0.00469