Trace elements in geological materials, such as rock, sediment, mineral and ore, are important from the stand-point of natural resource and the environment. To establish calibration for trace elements in such a broad range of geological materials, it is necessary to collect many reference materials covering a wide variety of compositions. Furthermore, it is not easy to determine the optimum conditions for trace element analysis of complex matrices of geological materials by the pressed powder method, which is applied because of low concentrations of trace elements. Rigaku provides an analysis package for trace element analysis of geological materials, named "GEO-TRACE- PAK".