AM_Gismondine_1 Formula: Ca Al2 Si2 O12.77 H12.64 Name: Gismondine Unit cell: 10.0155 10.6051 9.8277 90.0 92.409 90.0 , V=1042.93 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: ambient pressure