Robert Schoen C. E. Roberson 1973 <p>Some thermal water sources of the Snake River basin, Idaho, are near saturation with respect to fluorite. That mineral was identified by X-ray diffraction in precipitates induced in three water samples by adding sodium fluoride. The derived solubility product (K_S0) for zero ionic strength was close to that calculated from Latimer's thermodynamic data (10^{-9.7 7}). The relative ease of precipitation of fluorite from these water samples indicates that equilibrium with respect to fluorite may occur in some ground-water systems.</p> application/pdf en U.S. Geological Survey Fluorite equilibria in thermal springs of the Snake River Basin, Idaho article