When it comes to minerals, they have certain properties. One property is the hardness. Back in the day German mineralogist Friedrich Mohs had the idea to introduce Moh’s Scale, where you basically take two minerals and have a look which one can put scratches into the other. This scale has ten levels from extremely soft to hard like a diamond, however we might consider to update this scale especially when we consider that Thor’s Hammer obvisously looks like this:
Anyone who ever owned a Nokia should be able to relate to this.
Nevertheless, if you really do want to see a material that is harder than diamond, read up on these awesome aggregated diamond nanorods!