Portlandite Desgranges L, Grebille D, Calvarin g, Chevrier G, Floquet N, Niepce J Acta Crystallographica B49 (1993) 812-817 Hydrogen thermal motion in calcium hydroxide: Ca (O H)2 _cod_database_code 1001788 _database_code_amcsd 0009877 3.589 3.589 4.911 90 90 120 P-3m1 atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) O1 1/3 2/3 .7658 .0031 .0031 .0044 .00155 0 0 H1 .3599 .7198 .5725 .333 .0204 .0204 .0113 .0136 .0014 -.0014 Ca1 0 0 0 .0015 .0015 .0061 .00075 0 0