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 = 1.23(4) GPa ; _database_code_amcsd 0019517 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Mg Si O3' _cell_length_a 18.158 _cell_length_b 8.780 _cell_length_c 5.1574 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 822.230 _exptl_crystal_density_diffrn 3.244 _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 0.37710 0.48530 0.35550 0.00950 Mg1 0.37580 0.65420 0.86290 0.00640 SiTA 0.27138 0.34250 0.04740 0.00520 SiTB 0.47323 0.33710 0.80040 0.00490 O1A 0.18300 0.33970 0.03180 0.00530 O2A 0.31060 0.50380 0.04040 0.00670 O3A 0.30300 0.22340 0.82720 0.00620 O1B 0.56260 0.33910 0.80180 0.00590 O2B 0.43240 0.48310 0.68750 0.00660 O3B 0.44740 0.19400 0.60770 0.00440