Published experimental data (Marchand, 1976) and natural mineral association analyses enable determination of a set of values proportional to REE partition coefficients between hydrothermal mineral and aqueous fluid, in a mainly chlorine- and/or fluorine-bearing medium, for fluorite CaF2, apatite Ca5(PO4)3F, scheelite CaWO4, wolframite (Fe,Mn)WO4. It is thus possible to calculate forms of REE spectra for fluids associated with these minerals in an open environment. One can also deduce important results about fluid history, especially using vapor/magma partition coefficients determined by Flynn and Burnham (1978), and describe the magma, the source of the ore-bearing fluids. An application to a complex set of mineralizations is presented, allowing description of some peculiarities of the fluids associated with studied granites, especially their oxidized character and the influence of mixing with non-magmatic fluids.