AM_Gismondine_3 Formula: Ca Al2 Si2 O13 H10 Name: Gismondine Unit cell: 9.7975 10.626 9.6977 90.0 91.225 90.0 , V=1009.38 Space group: P121/C1 (14)

Ori S , Quartieri S , Vezzalini G , Dmitriev V , American Mineralogist , 93 (2008) p.1393-1403, Pressure-induced over-hydration and water ordering in gismondine:, a synchrotron powder diffraction study, Locality: Ballyclare, Ireland, Note: pressure = 1.9 GPa