data_global _chemical_name_mineral 'Narsarsukite' loop_ _publ_author_name 'Peacor D R' 'Buerger M J' _journal_name_full 'American Mineralogist' _journal_volume 47 _journal_year 1962 _journal_page_first 539 _journal_page_last 556 _publ_section_title ; The determination and refinement of the structure of narsarsukite, Na2TiOSi4O10 ; _database_code_amcsd 113 _chemical_formula_sum 'Ti Na2 Si4 O11' _cell_length_a 10.7269 _cell_length_b 10.7269 _cell_length_c 7.9476 _cell_angle_alpha 90.0 _cell_angle_beta 90.0 _cell_angle_gamma 90.0 _cell_volume 914.502 _exptl_crystal_density_diffrn 2.776 _symmetry_space_group_name_H-M 'I 4/m' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,1/2+z' 'y,-x,-z' '1/2+y,1/2-x,1/2-z' '-y,x,z' '1/2-y,1/2+x,1/2+z' 'x,y,-z' '1/2+x,1/2+y,1/2-z' '-x,-y,z' '1/2-x,1/2-y,1/2+z' '-y,x,-z' '1/2-y,1/2+x,1/2-z' 'y,-x,z' '1/2+y,1/2-x,1/2+z' '-x,-y,-z' '1/2-x,1/2-y,1/2-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Ti 0.0 0.0 0.2396 0.00165 Na 0.1858 0.1378 0.5 0.01748 Si 0.0118 0.3085 0.1924 -0.00114 O1 0.0 0.0 0.0 0.00063 O2 0.0 0.0 0.5 0.00253 O3 -0.04 0.3024 0.0 0.00215 O4 0.0488 0.1754 0.2684 0.00469 O5 0.1324 0.4023 0.1938 0.00405