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Our data demonstrate an extremely inhomogeneous distribution of the studied radionuclides on the rock samples. Low sorption activity towards all radionuclides is typical for quartz and unaltered feldspars (plagioclase and K-feldspar). The composition of mineral phases which are characterized by preferential sorption of radionuclides differs significantly. According to SEM-EDX analysis the highest sorption of radionuclides was attributed to: 1. magnetite, titanomagnetite, ilmenite and apatite for Pu and Am; 2. biotite, monazite, magnetite for Np; 3. muscovite including sericite and to less extent biotite for Ra. Contribution of different minerals in sorption of radionuclides was estimated quantitatively using OptiQuant software.