AM_Gismondine_4 Formula: Ca Al2 Si2 O12.95 H12.64 Name: Gismondine Unit cell: 10.0264 10.6094 9.8377 90.0 92.369 90.0 , V=1045.58 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 = 0 after decompression