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GEMS: Gibbs Energy Minimization Software for Geochemical Modeling

  • GEMS calculates the equilibrium state of a chemical system by minimizing its Gibbs free energy. This is coupled with detailed models of solid, liquid/aqueous, and gas phase behavior to ensure accurate descriptions of complex natural and engineered chemical systems. These can involve many (non)ideal solid or liquid solutions, gas mixture or non-ideal gaseous fluids.

  • GEMS along with its related codes and thermodynamic databases, are essential scientific tools for thermodynamic modeling of chemical processes, including among others aqueous speciation, solid-gas-liquid interactions, mineral dissolution/precipitation, reaction kinetics, oxidation/reduction, and sorption processes.

  • GEMS enables students, scientists, and engineers to learn and improve modeling skills, predict system behavior, optimize processes, and solve challenges in geochemistry, environmental science, waste disposal, material science, and chemical engineering.

A few of many types of calculations

  • Kaolinite solubility
  • Portlandite kinetics
  • Eu sorption on Illite
  • Solid solutions
  • Jupyter
  • box flux

GEM Software is always under development (as indicated in the Newsticker). Terms and Conditions of Use. Archived GEMS PSI website.