August 1997 issue
cif-access (organic compounds)
K2Sr[H4B4O9]2.10H2O and (NH4)2Ca[H4B4O9]2.8H2O contain alternate layers of tetraborate ions and two of the water molecules, and are completed by the cations and the remaining water molecules. The space group and number of water molecules of hydration depend on the nature of the cation.
The structure of [Zn3(AsO4)2]3.4H2O contains infinite chains of edge-sharing zinc octahedra and trigonal bipyramids. The chains are cross-linked by clusters of As and Zn tetrahedra to form a very dense three-dimensional framework.