Natrolite Wang H, Bish D L American Mineralogist 93 (2008) 1191-1194 A PH2O-dependent structural phase transition in the zeolite natrolite Sample: alpha2-metanatrolite Note: T = 400 C, P = 0.15 mbar Locality: synthetic _database_code_amcsd 0004618 17.574 18.161 6.3674 90 90 90 Fdd2 atom x y z occ Uiso Si1 0 0 0 .009 Si2 .1448 .2189 .623 .009 Al .0339 .0990 .606 .009 Na11 .005 .198 .742 .41 .051 Na12 .207 .051 .264 .59 .951 O1 .0325 .0673 .861 .020 O2 .0572 .1920 .611 .020 O3 .1020 .0513 .468 .020 O4 .1939 .1602 .757 .020 O5 .1798 .2204 .389 .020