AM_Gismondine_2 Formula: Ca Al2 Si2 O13 H12.64 Name: Gismondine Unit cell: 9.8917 10.5948 9.7482 90.0 92.2 90.0 , V=1020.86 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 = 1.6 GPa