Portlandite Nagai T, Ito T, Hattori T, Yamanaka T Physics and Chemistry of Minerals 27 (2000) 462-466 Compression mechanism and amorphization of portlandite, Ca(OH)2: structural refinement under pressure Sample: P = 4.3 GPa _database_code_amcsd 0008416 3.5104 3.5104 4.6294 90 90 120 P-3m1 atom x y z Biso Ca 0 0 0 .27 OH 1/3 2/3 .249 .9