Mohs Hardness Scale
The Mohs hardness scale for minerals has been used since 1822. It
simply consists of 10 minerals arranged in order from 1 to 10. Diamond
is rated as the hardest and is indexed as 10; talc as the softest with
index number 1. Each mineral in the scale will scratch all those below
it as follows:
| Diamond | 10 |
| Corundum | 9 |
| Topaz | 8 |
| Quartz | 7 |
| Orthoclase (Feldspar) | 6 |
| Apatite | 5 |
| Fluorite | 4 |
| Calcite | 3 |
| Gypsum | 2 |
| Talc | 1 |
Mohs Hardness Scale
The steps are not of equal value and the difference in hardness between
9 and 10 is much greater than between 1 and 2. The hardness is
determined by finding which of the standard minerals the test material
will scratch or not scratch; the hardness will lie between two points
on the scale - the first point being the mineral which is scratched and
the next point being the mineral which is not scratched. Some examples
of the hardness of common metals in the Mohs scale are copper between 2
and 3 and tool steel between 7 and 8. This is a simple test, but is not
exactly quantitative and the standards are purely arbitrary numbers.
The materials engineer and metallurgist find little use for the Mohs
scale, but it is possible to sub-divide the scale and some derived
methods are still commonly used today. The file test is useful as a
rapid and portable qualitative test for hardened steels, where
convention hardness testers are not available or practical. Files can
be tempered back to give a range of known hardness and then used in a
similar fashion to the Mohs method to evaluate hardness.
Links To:
Hardness Testing
Rockwell Hardness Test
Rockwell Superficial Hardness Test
Brinell Hardness Test
Vickers Hardness Test
Microhardness Test
Mohs Hardness Test
Scleroscope and other hardness testing methods
Hardness Conversion Tables and Charts:
Hardness Conversion Table(colour version - may take time to load)
Hardness Conversion Table(non-colour version)
Hardness Conversion Chart (1)
Hardness Conversion Chart (2)
Chart of Brinell, Vickers and Ultimate Tensile Strength Equivalents (1)
Chart of Brinell, Vickers andUltimate Tensile Strength Equivalents (2)
Hardness Conversion Table related to Rockwell C Hardness Scale (hard materials) (colour)
Hardness Conversion Table related to Rockwell C Hardness Scale (hard materials) (non-colour)
Hardness Conversion Chart related to Rockwell C Hardness Scales (hard materials)
Estimated Hardness Equivalent Chart related to Rockwell C and Vickers (hard materials)
Hardness Conversion Table related to Rockwell B Hardness Scale (soft metals) (colour)
Hardness Conversion Table related to Rockwell B Hardness Scale (soft metals) (non-colour)
Hardness Conversion Chart related to Rockwell B Hardness Scale (soft metals)
Table of Minimum Test Piece Thickness for Rockwell Hardness Testing using Ball Indenters
Table of Minimum Test Piece Thickness for Rockwell Hardness Testing using Diamond Indenters
HV, MPa and GPa Conversion Calculator
Telephone: +44 (0)1252 405186
Email: tsc@gordonengland.co.uk
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