data_global _chemical_name_mineral 'Ferrosilite' loop_ _publ_author_name 'Hugh-Jones D A' 'Chopelas A' 'Angel R J' _journal_name_full 'Physics and Chemistry of Minerals' _journal_volume 24 _journal_year 1997 _journal_page_first 301 _journal_page_last 310 _publ_section_title ; Tetrahedral compression in (Mg,Fe)SiO3 orthopyroxenes Sample: P = 1.71 GPa ; _database_code_amcsd 0008006 _chemical_formula_sum 'Fe Si O3' _cell_length_a 18.370 _cell_length_b 9.006 _cell_length_c 5.2084 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 861.679 _exptl_crystal_density_diffrn 4.068 _symmetry_space_group_name_H-M 'P b c a' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,1/2+z' '-x,1/2+y,1/2-z' '1/2-x,1/2+y,z' '1/2+x,1/2-y,-z' '1/2+x,y,1/2-z' '1/2-x,-y,1/2+z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv FeM1 0.37600 0.65550 0.86920 0.00557 FeM2 0.37830 0.48310 0.35960 0.00570 SiTA 0.27160 0.33970 0.04380 0.00304 SiTB 0.47280 0.33320 0.79090 0.00266 O1a 0.18590 0.34000 0.03100 0.00329 O2a 0.31180 0.50000 0.05200 0.00975 O3a 0.30160 0.23400 0.81000 0.00025 O1b 0.55990 0.33600 0.78900 0.00861 O2b 0.43290 0.48100 0.69100 0.00418 O3b 0.44770 0.19900 0.59100 0.00152