Cover illustration: The structure of 1-epialexine hemihydrate, shown with displacement ellipsoids drawn at the 50% probability level. See Thompson, Watkin, Gal, Jones, Hollinshead, Jenkinson, Fleet & Nash [Acta Cryst. (2008), C64, o649-o652].
The crystal structure of the mineral routhierite, Tl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6, was solved and refined for the first time, and consists of (Cu,Ag)S4 and (Hg,Zn)S4 tetrahedra, which share corners to form a framework with channels parallel to . These channels contain TlS6 and (As,Sb)S3 polyhedra that share corners and edges with the tetrahedra.
The crystal structures of the clinopyroxene-type compounds NaCrGe2O6 and LiCrGe2O6 have been determined. A comparison is made between the quasi-one-dimensional chromium-based silicate and germanate clinopyroxene crystal structures.