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Partition coefficient vs. temperature
A free, browser-based partition coefficient calculator for mineral–fluid geochemistry. Enter crystal concentration (C_crystal) and fluid concentration (C_fluid) measurements alongside temperature (°C) to compute D-values (D = C_crystal / C_fluid), ln(D), and inverse temperature (1/T in K⁻¹). Supports Arrhenius analysis with linear regression to derive activation enthalpy (ΔH) from the slope of ln(D) vs 1/T plots. Minerals supported include calcite, aragonite, apatite, monetite, dolomite, and custom phases. Crystal faces can be tagged per data point. Multiple datasets can be managed simultaneously. Sessions can be saved and reloaded as JSON; all computed values export as CSV.