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 = 24 C pyroxene ; _database_code_amcsd 336 _chemical_formula_sum 'Si2 Fe Na O6' _cell_length_a 9.658 _cell_length_b 8.795 _cell_length_c 5.294 _cell_angle_alpha 90.0 _cell_angle_beta 107.42 _cell_angle_gamma 90.0 _cell_volume 429.059 _exptl_crystal_density_diffrn 3.576 _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 0.2905 0.0894 0.2351 Fe1 0.0 0.8989 0.25 Na2 0.0 0.2999 0.25 O1 0.1141 0.0784 0.138 O2 0.3582 0.2558 0.3001 O3 0.3518 0.0079 0.0118 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 0.00215 0.00286 0.00498 -0.00033 -0.00068 -2e-05 Fe1 0.00353 0.00337 0.00591 0.0 -0.00045 0.0 Na2 0.01458 0.00741 0.01072 0.0 -0.00281 0.0 O1 0.0025 0.00486 0.006 -0.00057 -0.00125 0.00027 O2 0.00572 0.00333 0.00967 -0.00218 0.00038 0.0 O3 0.0046 0.00745 0.00662 0.0007 2e-05 -0.00191