Currently

the indentation test is an effective method to characterize the mechanical properties of materials such as metals

polymers and ceramics. The objective of this work is to provide a comprehensive methodology for the characterization of geomaterials (rocks) by microindentation (indentation in microns). The study concerns the calibration of the device and its application to the characterization of rocks. Compared with the conventional axial compression test

Young’s modulus and compression resistance obtained by microindentation test are discussed. On the other hand

for the purpose of the microindentation test under confining pressure

the modified apparatus is presented. Through this type of microindentation

the dependence of sandstone on the confining pressure is shown.