How well a mineral resists scratching is called?

The ability of a mineral to resist scratching is called its hardness. This property is commonly measured using the Mohs scale of mineral hardness, which ranks minerals from 1 (talc) to 10 (diamond), with each level representing a specific ability to scratch softer materials. The higher the number on the scale, the harder the mineral. Hardness is an important characteristic used in identifying and classifying minerals.