data_global _chemical_name_mineral 'Forsterite' loop_ _publ_author_name 'Ottonello G' 'Princivalle F' 'Della Giusta A' _journal_name_full 'Physics and Chemistry of Minerals' _journal_volume 17 _journal_year 1990 _journal_page_first 301 _journal_page_last 312 _publ_section_title ; Temperature, composition, and fO2 effects on intersite distribution of Mg and Fe2+ in olivines Sample: 3149b ; _database_code_amcsd 0007491 _chemical_formula_sum 'Mg1.139 Fe.825 Mn.03 Ca.006 Si O4' _cell_length_a 4.7891 _cell_length_b 10.3321 _cell_length_c 6.0346 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 298.601 _exptl_crystal_density_diffrn 3.731 _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 MgM1 0.00000 0.00000 0.00000 0.54800 0.00874 FeM1 0.00000 0.00000 0.00000 0.45200 0.00874 MgM2 0.98710 0.27860 0.25000 0.59100 0.00697 FeM2 0.98710 0.27860 0.25000 0.37300 0.00697 MnM2 0.98710 0.27860 0.25000 0.03000 0.00697 CaM2 0.98710 0.27860 0.25000 0.00600 0.00697 SiT 0.42780 0.09550 0.25000 1.00000 0.00785 O1 0.76620 0.09210 0.25000 1.00000 0.00963 O2 0.21530 0.45020 0.25000 1.00000 0.00937 O3 0.28230 0.16410 0.03480 1.00000 0.01026