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 = 5.4 GPa on release Note: high-pressure superhydrated phase _database_code_amcsd 0004012 12.910 12.910 6.540 90 90 90 I-42d atom x y z occ Uiso Na .691 .25 .125 .731 .022 Ca .691 .25 .125 .237 .022 Si1 0 0 0 .537 .022 Al1 0 0 0 .463 .022 Si2 .0575 .1351 .6235 .537 .022 Al2 .0575 .1351 .6235 .463 .022 O1 .379 .25 .125 .022 O2 .138 .045 .531 .022 O3 .020 .110 .873 .022 Wat4 .131 .25 .125 .022 Wat5 .898 .25 .125 .022