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: 3149* ; _database_code_amcsd 0007490 _chemical_formula_sum 'Mg1.139 Fe.825 Mn.03 Ca.006 Si O4' _cell_length_a 4.7871 _cell_length_b 10.3325 _cell_length_c 6.0347 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 298.493 _exptl_crystal_density_diffrn 3.732 _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 0.54700 0.00912 FeM1 0.00000 0.00000 0.00000 0.45300 0.00912 MgM2 0.98700 0.27870 0.25000 0.59200 0.00887 FeM2 0.98700 0.27870 0.25000 0.37200 0.00887 MnM2 0.98700 0.27870 0.25000 0.03000 0.00887 CaM2 0.98700 0.27870 0.25000 0.00600 0.00887 SiT 0.42800 0.09550 0.25000 1.00000 0.00836 O1 0.76630 0.09210 0.25000 1.00000 0.00950 O2 0.21560 0.44990 0.25000 1.00000 0.00988 O3 0.28230 0.16390 0.03490 1.00000 0.01039