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 = 4.09 GPa ; _database_code_amcsd 0001648 _chemical_formula_sum 'Mg Si O3' _cell_length_a 18.0710 _cell_length_b 8.6929 _cell_length_c 5.1214 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 804.518 _exptl_crystal_density_diffrn 3.315 _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 0.37580 0.65570 0.85960 0.00456 Mg2 0.37740 0.48440 0.35120 0.00570 SiA 0.27080 0.34380 0.04330 0.00304 SiB 0.47270 0.33680 0.80210 0.00304 O1a 0.18280 0.33900 0.02300 0.00317 O2a 0.30970 0.50700 0.03900 0.00393 O3a 0.30340 0.22400 0.82500 0.00266 O1b 0.56210 0.34000 0.80400 0.00912 O2b 0.43230 0.48300 0.69000 0.00380 O3b 0.44720 0.19200 0.61200 0.00063