December 1996 issue
K2Mn2(BeF4)3 has a langbeinite-type structure. Each Mn2+ cation is surrounded by six F− anions in the form of a distorted octahedron, each F− ion belonging to a different BeF42− tetrahedron. The K+ ions are nine-coordinate.
Tl2Cd2(SO4)3 has a langbeinite-type structure in which each Tl+ ion is surrounded by nine O atoms, forming an irregular polyhedron. Each Cd2+ ion is coordinated by six O atoms in the form of a distorted octahedron, each O atom belonging to a different sulfate ion.
The structure of GdKFe(CN)6.3H2O contains non-linear cyanide bridges which link octahedrally coordinated Fe atoms and eight-coordinate Gd atoms. Cavities within the structure are occupied by K+ ions and zeolitic water molecules.
Fe3Al2Si3 contains three iron, two aluminium and three silicon sites whose atomic environments derive from icosahedra. Fe3Al2Si4 contains two iron, one aluminium and three silicon sites whose atomic environments derive from hexagonal cuboctahedra.
Li2Nb0.5In1.5(PO4)3 contains PO4 tetrahedra and distorted MO6 octahedra with a statistical distribution of Nb and In atoms over the M sites. The framework contains cavities, one of which is fully occupied by Li+ while the other two are occupied by 1/3Li+ and 2/3Li+.