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: CC37c ; _database_code_amcsd 0007500 _chemical_formula_sum 'Mg1.792 Fe.2 Ni.005 Mn.003 Si O4' _cell_length_a 4.7606 _cell_length_b 10.2234 _cell_length_c 5.9942 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 291.735 _exptl_crystal_density_diffrn 3.353 _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 0.89300 0.00684 FeM1 0.00000 0.00000 0.00000 0.10200 0.00684 NiM1 0.00000 0.00000 0.00000 0.00500 0.00684 MgM2 0.99020 0.27760 0.25000 0.89900 0.00722 FeM2 0.99020 0.27760 0.25000 0.09800 0.00722 MnM2 0.99020 0.27760 0.25000 0.00300 0.00722 SiT 0.42680 0.09440 0.25000 1.00000 0.00570 O1 0.76620 0.09160 0.25000 1.00000 0.00671 O2 0.22000 0.44790 0.25000 1.00000 0.00684 O3 0.27830 0.16310 0.03330 1.00000 0.00735