Gonnardite Lee Y, Hriljac J A, Parise J B, Vogt T American Mineralogist 91 (2006) 247-251 Pressure-induced hydration in zeolite tetranatrolite Locality: Mt. Saint-Hilaire, Quebec, Canada Note: P = 4.2 GPa Note: high-pressure superhydrated phase _database_code_amcsd 0004011 12.959 12.959 6.5446 90 90 90 I-42d atom x y z occ Uiso Na .695 .25 .125 .731 .028 Ca .695 .25 .125 .237 .028 Si1 0 0 0 .537 .028 Al1 0 0 0 .463 .028 Si2 .0538 .1314 .6198 .537 .028 Al2 .0538 .1314 .6198 .463 .028 O1 .399 .25 .125 .028 O2 .140 .055 .521 .028 O3 .036 .115 .885 .028 Wat4 .130 .25 .125 .028 Wat5 .897 .25 .125 .028