AM_Portlandite_4 Formula: Ca (O2 H2) Name: Portlandite Unit cell: 3.5104 3.5104 4.6294 90.0 90.0 120.0 , V=49.40 Space group: P-3M1 (164)

Nagai T , Ito T , Hattori T , Yamanaka T , Physics and Chemistry of Minerals , 27 (2000) p.462-466, Compression mechanism and amorphization of portlandite,, Ca(OH)2: structural refinement under pressure, Sample: P = 4.3 GPa