data_global _chemical_name_mineral 'Cryolite' loop_ _publ_author_name 'Naray-Szabo S' 'Sasvari K' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 99 _journal_year 1938 _journal_page_first 27 _journal_page_last 31 _publ_section_title ; Die Struktur des Kryoliths Na3 Al F6 _cod_database_code 1010932 ; _database_code_amcsd 0017654 _chemical_formula_sum 'Al Na3 F6' _cell_length_a 5.46 _cell_length_b 5.61 _cell_length_c 7.8 _cell_angle_alpha 90 _cell_angle_beta 90.18 _cell_angle_gamma 90 _cell_volume 238.918 _exptl_crystal_density_diffrn 2.918 _symmetry_space_group_name_H-M 'P 1 21/n 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2-y,1/2+z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Al1 0.00000 0.00000 0.00000 Na1 0.00000 0.00000 0.50000 Na2 0.50000 -0.05500 0.24000 F1 0.06500 0.06000 0.22000 F2 -0.29000 0.16000 0.03000 F3 0.15000 0.28000 -0.06000