Linear correlations of Gibbs free energy for rare earth element oxide, hydroxide, chloride, fluoride, carbonate, and ferrite minerals and crystalline solids

We recommend a set of internally consistent ΔGof, REEX for 119 end-members of REE oxides, hydroxides, chlorides, fluorides, carbonates, hydrous carbonates, and ferrites. These ΔGof, REEX are combined with experimental or predicted values of So, Vo, and Cpo from the literature and incorporated into a new SUPCRT database, which allows the calculations of thermodynamic properties to high P-T conditions (e.g., up to 1000 oC and 5 kb). The log Ksp of REE solid dissociation reactions were incorporated into a modified USGS program PHREEQC for calculations of speciation, solubility, and reactive transport. These thermodynamic databases will also be incorporated into the MINES database to be used together with the GEMS code package in the future.