Tyuyamunite synthesis

Methods of tyuyamunite synthesis under laboratory conditions are described. It is ascertained, that under the ratio of Ca2+ ion activity to the square of K+ ion activity, exceeding 105.89 tyuyamunite is produced, and under the lower values of this ratio-carnate. This is as well confirmed by thermodynamic calculations and experiments, simulating the process of uranyl-vanadate of mineralization formation. A conclusion is made that a wide expansion of tyuyamunite in the nature is related only to geochemical specialization of ore-bearing solutions producing uranyl vanadates