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A high dilution ratio glass bead with a sample to flux ratio of 1:10 was prepared for a wide range of major element analyses using X-ray fluorescence spectrometer. Calibration curves were determined from 16 rock standards of the Geological Survey of Japan (GSJ) and 4 synthetic samples employing the software of the instrument. The precision of the calibration curves was sufficiently high, and the reproducibility was of adequate quality when compared to the 1:10 glass bead methods in other institutions laboratories. This method enables the measurement of igneous and metamorphic rocks that have extreme or anomalous bulk chemical compositions.

XRF major element analyses of silicate rocks using 1:10 dilution ratio glass bead and a synthetically extended calibration curve method