TRACE ELEMENT FINGER PRINTING OF EMERALD BY PIXE AND PIGE

The concentrations of 18 major- and minor-elements in 12 Emeralds from different mines and two synthetic ones are measured with proton induced X-ray emission (PIXE) and y-ray emission (PIGE) . The concentration and distribution of 18 elements are used to establish the characteristic finger print pattern of each Emerald. With the help of cluster analysis of SYSTAT statistical package for IBMPC, these finger prints are analysed, from which a quantitative description of the dissimilarities between Emeralds can be given.