Poldervaartite Heller L Acta Crystallographica 5 (1952) 724-728 The structure of dicalcium silicate alpha-hydrate Locality: synthetic Ca2SiO3OHOH _database_code_amcsd 0009148 9.34 9.22 10.61 90 90 90 Pbca atom x y z Ca1 .452 .640 .754 Ca2 .385 .022 .430 Si1 .754 .304 .975 O1 .439 .358 .662 O2 .595 .336 .928 O3 .809 .174 .886 O4 .865 .434 .966 O5 .739 .271 .124