The special features of X-ray fluorescence analysis application to the determination of Mo, Nb, Zr, Y,Sr, Rb, U, Th and Pb in various types of aluminum silicate rocks are presented. The intensities of the analytical lines and the background were measured using the new Bruker S4 EXPLORER spectrometer. The ranges of analysed contents were (in ppm) 10 to 260 for Mo, 3 to 380 for Nb, 20 to 630 for Zr, 5 to 150 for Y, 5 to 3300 for Sr, 10 to 1500 for Rb, 2 to 63 for U, 5 to 130 for Th and 5 to 250 for Pb.
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