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: CC37* ; _database_code_amcsd 0007497 _chemical_formula_sum 'Mg1.793 Fe.199 Ni.005 Mn.003 Si O4' _cell_length_a 4.7624 _cell_length_b 10.2243 _cell_length_c 5.9922 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 291.773 _exptl_crystal_density_diffrn 3.352 _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 0.89200 0.00583 FeM1 0.00000 0.00000 0.00000 0.10300 0.00583 NiM1 0.00000 0.00000 0.00000 0.00500 0.00583 MgM2 0.98990 0.27770 0.25000 0.90100 0.00595 FeM2 0.98990 0.27770 0.25000 0.09600 0.00595 MnM2 0.98990 0.27770 0.25000 0.00300 0.00595 SiT 0.42680 0.09440 0.25000 1.00000 0.00481 O1 0.76620 0.09170 0.25000 1.00000 0.00595 O2 0.22060 0.44780 0.25000 1.00000 0.00570 O3 0.27850 0.16320 0.03320 1.00000 0.00646