data_global _chemical_name_mineral 'Enstatite' loop_ _publ_author_name 'Periotto B' 'Balic-Zunic T' 'Nestola F' 'Katerinopoulou A' 'Angel R J' _journal_name_full 'American Mineralogist' _journal_volume 97 _journal_year 2012 _journal_page_first 1741 _journal_page_last 1748 _publ_section_title ; Re-investigation of the crystal structure of enstatite under high-pressure conditions Note: P = 0.22(3) GPa ; _database_code_amcsd 0019516 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Mg Si O3' _cell_length_a 18.204 _cell_length_b 8.810 _cell_length_c 5.1731 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 829.648 _exptl_crystal_density_diffrn 3.215 _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 Mg2 0.37670 0.48630 0.35770 0.00940 Mg1 0.37590 0.65380 0.86540 0.00690 SiTA 0.27160 0.34190 0.04940 0.00510 SiTB 0.47346 0.33740 0.79890 0.00510 O1A 0.18320 0.33920 0.03540 0.00480 O2A 0.31050 0.50280 0.04280 0.00670 O3A 0.30300 0.22420 0.82940 0.00560 O1B 0.56270 0.34020 0.79980 0.00600 O2B 0.43250 0.48260 0.68850 0.00810 O3B 0.44770 0.19540 0.60500 0.00490