Natrolite Baur W H, Kassner D, Kim C, Sieber N H W European Journal of Mineralogy 2 (1990) 761-769 Flexibility and distortion of the framework of natrolite: crystal structures of ion-exchanged natrolites Sample: K-natrolite, KK _database_code_amcsd 0006393 19.27 19.66 6.469 90 90 90 Fdd2 atom x y z K .2185 .5310 .121 Al .2023 .3359 .859 Si1 0 0 0 Si2 .1614 .2028 .620 O1 .0418 .0541 .859 O2 .1633 .4155 .860 O3 .1541 .2789 .713 O4 .2859 .3416 .761 O5 .9447 .0409 .141 Wat .1743 .4241 .370