AM_Gonnardite_9
Formula: Na1.462 Ca.474 (Si2.685 Al2.315) O14 H4
Name: Gonnardite
Unit cell: 12.91 12.91 6.54 90.0 90.0 90.0 , V=1090.01
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 = 5.4 GPa on release, Note: high-pressure superhydrated phase