data_global _chemical_name_mineral 'Aegirine' loop_ _publ_author_name 'Cameron M' 'Sueno S' 'Prewitt C T' 'Papike J J' _journal_name_full 'American Mineralogist' _journal_volume 58 _journal_year 1973 _journal_page_first 594 _journal_page_last 618 _publ_section_title ; High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene, and ureyite T = 600 C pyroxene ; _database_code_amcsd 338 _chemical_formula_sum 'Si2 Fe Na O6' _cell_length_a 9.699 _cell_length_b 8.855 _cell_length_c 5.307 _cell_angle_alpha 90.0 _cell_angle_beta 107.32 _cell_angle_gamma 90.0 _cell_volume 435.123 _exptl_crystal_density_diffrn 3.526 _symmetry_space_group_name_H-M 'C 1 2/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '-x,y,1/2-z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' '1/2-x,1/2-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Si 0.2902 0.0889 0.2332 Fe1 0.0 0.8974 0.25 Na2 0.0 0.3001 0.25 O1 0.1142 0.0775 0.1364 O2 0.3587 0.2537 0.2975 O3 0.3511 0.0074 0.0098 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 Si 0.01034 0.01446 0.00988 -0.00129 0.0029 -0.00091 Fe1 0.01207 0.0149 0.01199 0.0 0.00295 0.0 Na2 0.0466 0.03027 0.02664 0.0 -0.00482 0.0 O1 0.01047 0.02149 0.01328 -0.00087 0.00238 0.00152 O2 0.0225 0.01728 0.02517 -0.00735 0.00711 -0.00127 O3 0.01459 0.02773 0.01398 0.0005 0.00335 -0.00545