data_global _chemical_name_mineral 'Forsterite' loop_ _publ_author_name 'Liang J' 'Hawthorne F C' _journal_name_full 'The Canadian Mineralogist' _journal_volume 32 _journal_year 1994 _journal_page_first 541 _journal_page_last 552 _publ_section_title ; Characterization of fine-grained mixtures of rock-forming minerals by Rietveld structure refinement: olivine + pyroxene Sample: P4 Rietveld, 39.7% olivine ; _database_code_amcsd 0005400 _chemical_formula_sum 'Si (Mg1.816 Fe.184) O4' _cell_length_a 4.7652 _cell_length_b 10.2388 _cell_length_c 5.9992 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 292.701 _exptl_crystal_density_diffrn 3.324 _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 Si 0.42800 0.09500 0.25000 1.00000 0.00494 MgM1 0.00000 0.00000 0.00000 0.91800 0.00507 FeM1 0.00000 0.00000 0.00000 0.08200 0.00507 MgM2 0.99000 0.27800 0.25000 0.89800 0.00519 FeM2 0.99000 0.27800 0.25000 0.10200 0.00519 O1 0.76800 0.09200 0.25000 1.00000 0.00633 O2 0.21700 0.44300 0.25000 1.00000 0.00608 O3 0.27300 0.16300 0.03200 1.00000 0.00659