data_global _chemical_name_mineral 'Natrolite-NH4 exchanged' loop_ _publ_author_name 'Stuckenschmidt E' 'Kassner D' 'Joswig W' 'Baur W H' _journal_name_full 'European Journal of Mineralogy' _journal_volume 4 _journal_year 1992 _journal_page_first 1229 _journal_page_last 1240 _publ_section_title ; Flexibility and distortion of the collapsible framework of NAT topology: the crystal structure of NH4-exchanged natrolite ; _database_code_amcsd 0006462 _chemical_formula_sum 'Si3 Al2 O10 N2 H8' _cell_length_a 17.899 _cell_length_b 18.390 _cell_length_c 6.529 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90.0 _cell_volume 2149.103 _exptl_crystal_density_diffrn 2.066 _symmetry_space_group_name_H-M 'C 1 1 21' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' '-x,1/2-y,1/2+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 Si11 0.49966 0.49286 0.00070 0.00880 Si13 0.25710 0.75007 0.74960 0.01030 Si21 0.34558 0.28565 0.62550 0.00810 Si22 0.64876 0.71517 0.62450 0.00770 Si23 0.40258 0.53316 0.37310 0.00840 Si24 0.09972 0.96398 0.37420 0.00920 Al11 0.46489 0.40239 0.61690 0.00810 Al12 0.53541 0.59234 0.61700 0.00820 Al13 0.28664 0.65342 0.36450 0.00860 Al14 0.21584 0.84406 0.36530 0.00860 O11 0.51160 0.56290 0.85790 0.01520 O12 0.48390 0.41910 0.87260 0.01420 O13 0.26870 0.67720 0.61960 0.01790 O14 0.24090 0.82110 0.61460 0.01870 O21 0.42970 0.31470 0.58700 0.01120 O22 0.56520 0.68200 0.62800 0.01020 O23 0.31840 0.56350 0.35690 0.01200 O24 0.18430 0.93350 0.36040 0.01200 O31 0.40150 0.46550 0.52750 0.01700 O32 0.60220 0.53820 0.50540 0.01850 O33 0.64960 0.78720 0.75830 0.01620 O34 0.35050 0.21790 0.78050 0.01310 O41 0.29550 0.34870 0.72270 0.01630 O42 0.70720 0.65610 0.70490 0.01630 O43 0.46040 0.59480 0.44800 0.01250 O44 0.54390 0.40520 0.46880 0.01760 O51 0.31320 0.26130 0.39980 0.01590 O52 0.66740 0.73340 0.38030 0.01420 O53 0.57480 0.48290 0.14140 0.01900 O54 0.42640 0.50640 0.14760 0.01700 N1 0.44740 0.28520 0.09000 0.02030 H11 0.42500 0.28700 0.22400 0.02030 H12 0.45400 0.33530 0.05400 0.02030 H13 0.49500 0.26400 0.09100 0.02030 H14 0.41500 0.26100 0.00100 0.02030 N2 0.47410 0.81040 0.65120 0.02040 H21 0.50900 0.83700 0.74000 0.02040 H22 0.45400 0.84000 0.54700 0.02040 H23 0.42900 0.78900 0.71900 0.02040 H24 0.49500 0.77100 0.58300 0.02040 N3 0.72080 0.44380 0.89470 0.03010 H31 0.73100 0.41000 0.78600 0.03010 H32 0.72500 0.42200 1.02700 0.03010 H33 0.75200 0.48600 0.88600 0.03010 H34 0.67100 0.46100 0.86300 0.03010 N4 0.29400 0.54370 0.86400 0.03800 H41 0.27700 0.57600 0.76200 0.03800 H42 0.33400 0.51600 0.81700 0.03800 H43 0.30900 0.57100 0.97800 0.03800 H44 0.25200 0.51400 0.90900 0.03800