data_global _chemical_name_mineral 'Natrolite' loop_ _publ_author_name 'Krogh Andersen E' 'Krogh Andersen I G' 'Ploug-Sorensen G' _journal_name_full 'European Journal of Mineralogy' _journal_volume 2 _journal_year 1990 _journal_page_first 799 _journal_page_last 807 _publ_section_title ; Disorder in natrolites: structure determinations of three disordered natrolites and one lithium-exchanged disordered natrolite Example: Na I ; _database_code_amcsd 0006399 _chemical_formula_sum 'Na2 Al2 Si3 O12 H4' _cell_length_a 18.305 _cell_length_b 18.632 _cell_length_c 6.589 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 2247.236 _exptl_crystal_density_diffrn 2.248 _symmetry_space_group_name_H-M 'F d d 2' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2+y,1/2+z' '1/2+x,y,1/2+z' '1/2+x,1/2+y,z' '1/4+x,1/4-y,1/4+z' '1/4+x,3/4-y,3/4+z' '3/4+x,1/4-y,3/4+z' '3/4+x,3/4-y,1/4+z' '1/4-x,1/4+y,1/4+z' '1/4-x,3/4+y,3/4+z' '3/4-x,1/4+y,3/4+z' '3/4-x,3/4+y,1/4+z' '-x,1/2-y,1/2+z' '-x,-y,+z' '1/2-x,1/2-y,+z' '1/2-x,-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 Na 0.22082 0.03054 0.61746 0.01862 Al 0.03740 0.09378 0.61532 0.00671 Si1 0.00000 0.00000 0.00000 0.00557 Si2 0.15339 0.21138 0.62316 0.00697 O1 0.02266 0.06857 0.86591 0.01545 O2 0.07002 0.18177 0.60982 0.00975 O3 0.09821 0.03506 0.50069 0.01393 O4 0.20680 0.15280 0.72596 0.01368 O5 0.18047 0.22735 0.38976 0.01634 O6 0.05638 0.18962 0.11151 0.02444 H1 0.05350 0.14980 0.06170 0.02533 H2 0.09190 0.18960 0.17560 0.02533