Thermodynamic studies of systems that contain hydrogen sulfide and iron sulfide are of particular relevance to various
research areas,1-9 including geochemistry, oceanography, sedimentology, chalcogenide synthesis, and, because of the production of oil and gas in sour environments, corrosion. Although small concentrations of H2S seem to act to inhibit corrosion, because of the formation of a protective iron sulfide film/scale on steel surfaces, large concentrations can lead to pitting, severe localized corrosion, and catastrophic failure.