How hard is solid material?

The hardness of solid materials varies widely depending on their composition and structure. Hardness is typically measured using scales such as Mohs, Vickers, or Brinell, with diamond being one of the hardest known materials. Factors like atomic bonding, crystal structure, and impurities can influence a material's hardness. Generally, metals tend to be less hard than ceramics or certain minerals, which can be extremely hard.