Subvolume 27B compiles the magnetic properties of of pnictides and chalcogenides; the present subvolume 27B6 deals with actinide pnictides and chalcogenides. Subvolume 27B6 has been spilt in two parts; the present part 27B6 discusses actinide monochalcogenides specifically compounds of actinides and actinide alloys with sulphur, selenium, and tellurium. Beyond magnetic properties, the book reviews crystal structure, results of neutron diffraction studies, nuclear gamma resonance, nuclear magnetic resonance, X-ray absorption spectroscopy, transport properties, and dielectric and optical data.