keywords DEW model DIELECTRIC-CONSTANT Geochemical modeling Geochemistry & Geophysics HEAT-CAPACITIES HIGH-PRESSURES HIGH-TEMPERATURES HYDROTHERMAL SYSTEMS Helgeson-Kirkham-Flowers equation of state IAPWS95 equation of state LogK-density extrapolation NATURAL-WATERS PARTIAL MOLAL PROPERTIES PRIMARY MINERALS Physical Sciences SOFTWARE PACKAGE Science & Technology Solid-solutions TRANSPORT-PROPERTIES Thermodynamic database Thermodynamic properties Variable-chemistry clays