data_global _amcsd_formula_title 'RbFeSi3O8' loop_ _publ_author_name 'Brunton G D' 'Harris L A' 'Kopp O C' _journal_name_full 'American Mineralogist' _journal_volume 57 _journal_year 1972 _journal_page_first 1720 _journal_page_last 1728 _publ_section_title ; Crystal structure of a rubidium iron feldspar ; _database_code_amcsd 297 _chemical_formula_sum 'Rb (Si2.912 Fe1.088) O8' _cell_length_a 8.952 _cell_length_b 13.127 _cell_length_c 7.359 _cell_angle_alpha 90.05 _cell_angle_beta 116.47 _cell_angle_gamma 89.35 _cell_volume 774.063 _exptl_crystal_density_diffrn 3.055 _symmetry_space_group_name_H-M 'C -1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,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 _atom_site_occupancy Rb1 0.29248 -0.00054 0.14784 1.0 Si1o 0.0071 -0.80854 0.219 0.513 Fe1o 0.0071 -0.80854 0.219 0.487 Si1m 0.0073 -0.19027 0.2228 0.611 Fe1m 0.0073 -0.19027 0.2228 0.389 Si2o 0.7202 -0.8808 0.3422 0.89 Fe2o 0.7202 -0.8808 0.3422 0.11 Si2m 0.7197 -0.1178 0.3443 0.898 Fe2m 0.7197 -0.1178 0.3443 0.102 OA1 0.6657 0.0008 0.2821 1.0 OA2 0.0002 -0.1482 0.0051 1.0 OBo 0.8217 -0.8422 0.2228 1.0 OBm 0.8242 -0.1576 0.2272 1.0 OCo 0.0467 -0.6799 0.2633 1.0 OCm 0.0458 -0.3172 0.2671 1.0 ODo 0.1736 -0.8749 0.4114 1.0 ODm 0.1702 -0.1264 0.4138 1.0 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 Rb1 0.02505 0.03072 0.02528 0.00085 0.01118 0.00692 Si1o 0.01756 0.01859 0.01605 0.00437 0.00882 0.00293 Fe1o 0.01756 0.01859 0.01605 0.00437 0.00882 0.00293 Si1m 0.01854 0.01981 0.01737 -0.00155 0.00936 -0.00333 Fe1m 0.01854 0.01981 0.01737 -0.00155 0.00936 -0.00333 Si2o 0.02212 0.01746 0.01561 0.0016 0.00829 -0.00044 Fe2o 0.02212 0.01746 0.01561 0.0016 0.00829 -0.00044 Si2m 0.02114 0.01667 0.01495 0.00213 0.00775 0.00131 Fe2m 0.02114 0.01667 0.01495 0.00213 0.00775 0.00131 OA1 0.05367 0.02008 0.02814 0.0016 0.00294 -0.00131 OA2 0.02212 0.0288 0.05012 -0.00213 0.01043 -0.00394 OBo 0.03773 0.04975 0.03847 -0.00266 0.02674 -0.0092 OBm 0.04326 0.04975 0.04683 0.00533 0.0361 0.01183 OCo 0.02927 0.0288 0.0255 -0.0016 0.01016 0.00131 OCm 0.02537 0.03055 0.02528 0.00213 0.00829 -0.0035 ODo 0.03155 0.02444 0.01583 0.00266 0.00722 0.00131 ODm 0.02927 0.02269 0.01627 0.0 0.00321 0.00088