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When comes to hardness, most people are familiar with the Mohs hardness scale. This system determines the hardness based upon surface wear – 

The softest material used is talc (value=1) and the hardest material is diamond (value=10). Given that the references used for the Mohs scale do 

The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell test determines the hardness by measuring the depth of 

A Rockwell hardness number for a material is a unitless number indicating the hardness value on a specified Rockwell scale. The equation for Rockwell Hardness Number is given by HR=N- (d/s) Where, N and s are scale factors depending on the test being used. The value of N is either 100 or 130 depending on the Rockwell hardness scale used.

The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). [1] There are different scales, denoted by a single letter, that use different loads or indenters.

Mohs hardness test. If you wish to measure the scratch hardness, this is a suitable method you can adopt. Traditionally, this test is performed by scratching the material against a reference

The instrument is then pressed against the material until the flat metal plate in the bottom is levelled with the elastomer sample. In its scale, higher numbers 

The Mohs scale is a system used to rank materials on their hardness, which is graded using numbers from 1 to 10. It can be used to compare gemstones, 

Because granite varies in the porosity and composition, the hardness is a range; usually from 6 to 7. Quartz, 7, Quartz is an engineered material using polymer 

The hardness number can then be read using different Rockwell hardness scales (A, B, C, etc.). The ideal scale depends on the type of indenter