data_global _chemical_name_mineral 'Tongbaite' loop_ _publ_author_name 'Rundqvist S' 'Runnsjo G' _journal_name_full 'Acta Chemica Scandinavica' _journal_volume 23 _journal_year 1969 _journal_page_first 1191 _journal_page_last 1199 _publ_section_title ; Crystal structure refinement of Cr3C2 Note: values obtained from intensities recorded photographically ; _database_code_amcsd 0011913 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Cr3 C2' _cell_length_a 5.5329 _cell_length_b 2.8290 _cell_length_c 11.4719 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 179.565 _exptl_crystal_density_diffrn 6.659 _symmetry_space_group_name_H-M 'P n m a' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,z' '-x,1/2+y,-z' '1/2-x,1/2+y,1/2+z' '1/2+x,1/2-y,1/2-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 Cr1 0.01570 0.25000 0.40150 0.00203 Cr2 0.18080 0.25000 0.77370 0.00177 Cr3 0.86910 0.25000 0.93120 0.00152 C1 0.10080 0.25000 0.20550 0.00367 C2 0.24320 0.25000 0.95360 0.00215