In this paper, we demonstrate that an azimuthally independent nanohardness determination can be achieved by using a conical indenter. 
conical indenter
Conical Nanoindentation Allows Azimuthally Independent Hardness Determination in Geological and Biogenic Minerals.The remarkable mechanical performance of biominerals often relies on distinct crystallographic textures, which complicate the determination of the nanohardness from indentations with the standard non-rotational-symmetrical Berkovich punch. 
Berkovich punch