The method of using Mossbauer spectroscopy at room temperature was applied to assign the iron sites in one fresh zinc ferrite sample ZF with (1:1) concentration of their component oxides and calcined at 900C as well as its sulfurization derivatives at 750C in different coal gas of composition 0.5% H2S + 0.5% H2; 0.5% H2S + 10% H2; 0.5% H2S + 25% H2, and 0.5% H2S + 10% H2O (v). The most important iron phase obtained in the sulfurized samples, was pyrrhotite, Fe1-xS that exhibit three well different ional sextets. From the peak area and the associated magnetic hyperfine fields, the average magnetic field was calculated and indicates lowering in the number of iron vacancies whereas x is close to 0.