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 = 0.5 GPa _database_code_amcsd 0008414 3.5682 3.5682 4.8625 90 90 120 P-3m1 atom x y z Biso Ca 0 0 0 .30 OH 1/3 2/3 .233 1.0