data_global _chemical_name_mineral 'Forsterite' loop_ _publ_author_name 'Redfern S A T' 'Artioli G' 'Rinaldi R' 'Henderson C M B' 'Knight K S' 'Wood B J' _journal_name_full 'Physics and Chemistry of Minerals' _journal_volume 27 _journal_year 2000 _journal_page_first 630 _journal_page_last 637 _publ_section_title ; Octahedral cation ordering in olivine at high temperature. II: an in situ neutron powder diffraction study on synthetic MgFeSiO4 (Fa50) Sample: T = 1250 C ; _database_code_amcsd 0008474 _chemical_formula_sum '(Fe Mg) Si O4' _cell_length_a 4.8497 _cell_length_b 10.5034 _cell_length_c 6.1418 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 312.853 _exptl_crystal_density_diffrn 3.657 _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 FeM1 0.00000 0.00000 0.00000 0.42000 0.02010 MgM1 0.00000 0.00000 0.00000 0.58000 0.02010 FeM2 0.97640 0.28180 0.25000 0.58000 0.03270 MgM2 0.97640 0.28180 0.25000 0.42000 0.03270 Si 0.42090 0.09540 0.25000 1.00000 0.01830 O1 0.76720 0.09670 0.25000 1.00000 0.02190 O2 0.22110 0.45400 0.25000 1.00000 0.02980 O3 0.28570 0.16580 0.03990 1.00000 0.02520