data_global _chemical_name_mineral 'Enstatite' loop_ _publ_author_name 'Hugh-Jones D A' 'Angel R J' _journal_name_full 'American Mineralogist' _journal_volume 79 _journal_year 1994 _journal_page_first 405 _journal_page_last 410 _publ_section_title ; A compressional study of MgSiO3 orthoenstatite up to 8.5 GPa Sample: P = 4.95 GPa ; _database_code_amcsd 0001649 _chemical_formula_sum 'Mg Si O3' _cell_length_a 18.0455 _cell_length_b 8.6708 _cell_length_c 5.1119 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 799.854 _exptl_crystal_density_diffrn 3.335 _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 Mg1 0.37600 0.65520 0.85900 0.00355 Mg2 0.37740 0.48480 0.35000 0.00646 SiA 0.27050 0.34320 0.04100 0.00405 SiB 0.47280 0.33830 0.80220 0.00190 O1a 0.18270 0.33900 0.02400 0.00418 O2a 0.30850 0.50800 0.03500 0.00114 O3a 0.30420 0.22300 0.82600 0.00139 O1b 0.56110 0.34000 0.80500 0.00431 O2b 0.43250 0.48400 0.68500 0.00431 O3b 0.44700 0.19000 0.61300 0.00089