AM_Gonnardite_3
Formula: (Si2.685 Al2.315) O12.37 Na1.462 Ca.474 H8
Name: Gonnardite
Unit cell: 13.0666 13.0666 6.6632 90.0 90.0 90.0 , V=1137.65
Space group: I-42D (122)

Lee Y , Hriljac J A , Vogt T , American Mineralogist , 90 (2005) p.247-251, Variable-temperature structural studies of tetranatrolite from Mt. Saint-Hilaire:, Synchrotron X-ray powder diffraction and Rietveld analysis, Sample: T = 100 C