The Mohs hardness scale characterizes minerals according to their resistance to be scratched. According to this scale, the correct list is: corundum, quartz, calcite, gypsum.
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Theoretical framework:
Hardness is one of the physical properties of minerals and is a significant one when identifying and recognizing them.
Hardness measures the resistance level of a surface to abrasion. In the specific case of minerals, it measures how minerals resist being scratched or penetrated.
The hardness level is determined by an attempt to scratch or produce a mark on an unmarked surface using sharp elements, such as nails, copper coin, glass, or a steal knife. Notice that these elements also vary in their hardness.
There are different methods used to define hardness, and they are not comparable to each other. The Mohs hardness method defines an ordinary qualitative scale that characterizes the mineral according to their resistance to being scratched by a harder element.
According to the Mohs hardness scale, from the hardest to the softest hardness level, minerals are placed as follows,
Hardest level
Softest level
According to this scale, the following list is the correct option ⇒ corundum, quartz, calcite, gypsum.
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