Experimental verification of the hypothesis of silicates phosphatization in conditions of the supergene zone was carried out. In addition to previous experiments with clay minerals (kaolinite and montmorillonite), phosphatization of aluminosilicates of other structural types (hornblende, orthoclase, and labrador), which for 9 months interacted with 1.2–6.0 mM orthophosphate solutions over a wide range of acidity, was studied. The existence of common for all minerals close to the linear

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... e between changes in the concentrations of phosphorus and silicon in solution Δ[Si] ≈ –Δ[P]. is ascertained. The possibility of aluminosilicates substitution with phosphate minerals at relatively low concentrations of dissolved phosphorus, corresponding to the phosphate content in soil solutions, is proved.