AM_Gonnardite Formula: (Si2.85 Al2.15) Ca.46 Na1.16 O13.4 Name: Gonnardite Unit cell: 13.267 13.267 6.6023 90.0 90.0 90.0 , V=1162.09 Space group: I-42D (122)

Artioli G , Galli E , American Mineralogist , 84 (1999) p.1445-1450, Gonnardite: Re-examination of holotype material, and discreditation of, tetranatrolite