Can be tested by scratching

The phrase "can be tested by scratching" typically refers to the method used to assess the hardness of a material, such as minerals. This is often done using the Mohs scale of mineral hardness, where a material is scratched with another material of known hardness to determine its position on the scale. By observing whether a scratch occurs, one can evaluate the material's resistance to abrasion. This simple test provides valuable information about the material's properties and durability.