data_global _chemical_name_mineral 'Durangite' loop_ _publ_author_name 'Kokkoros P' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 99 _journal_year 1938 _journal_page_first 38 _journal_page_last 49 _publ_section_title ; Uber die struktur des durangit NaAlF[AsO4] ; _database_code_amcsd 0010570 _chemical_compound_source 'Durango, Mexico' _chemical_formula_sum 'Na Al As O4 F' _cell_length_a 6.53 _cell_length_b 8.46 _cell_length_c 7.00 _cell_angle_alpha 90 _cell_angle_beta 115.22 _cell_angle_gamma 90 _cell_volume 349.845 _exptl_crystal_density_diffrn 3.947 _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 Na 0.00000 0.66700 0.25000 Al 0.00000 0.00000 0.00000 As 0.00000 0.31700 0.25000 OA 0.20800 0.43300 0.41700 OB 0.09200 0.21100 0.09700 F 0.00000 0.94400 0.25000