Packing with the tetrahedra of sulphur atoms close to p-aspect atoms in the structures in the AgGaS2, AgGaGeS4 and KGaGeS4 compounds.AgGaGeS4 compound (AGGS) is usually a promising nonlinear content for mid-IR apps. The several measures of this elements processing are presented. The chemical synthesis of polycrystals and The one crystal growth proc