AM_Gonnardite_7 Formula: Na1.462 Ca.474 (Si2.685 Al2.315) O12.74 H4.06 Name: Gonnardite Unit cell: 13.1988 13.1988 6.6288 90.0 90.0 90.0 , V=1154.79 Space group: I-42D (122)

Lee Y , Hriljac J A , Parise J B , Vogt T , American Mineralogist , 91 (2006) p.247-251, Pressure-induced hydration in zeolite tetranatrolite, Locality: Mt. Saint-Hilaire, Quebec, Canada, Note: P = 0 GPa