Friedrich Mohs introduced a popular hardness scale to quantify hardness, mainly to help in identification of minerals and gems.
Mohs’ Scale | Rosiwal-grinding-hardness | Material for comparison |
Graphite | ||
1 Talcium | 0.03 | |
Lead, tin | ||
2 Gypsium, rock salt | 1.25 | |
Aluminium, zinc, magnesium, copper, silver, gold | ||
3 Calcite | 4.5 | Marble, brass, iron, nickel |
4 Fluorspar | 5 | |
Steels unhardened | ||
5 Apatite | 6.5 | |
Window glass | ||
6 Feldspar | 37 | |
Low-carbon steels, hardened | ||
7 Quartz | 120 | |
0.9% C steel, hardened; tungsten | ||
8 Topaz | 175 | |
Special Steels | ||
9 Corundum | 1000 | |
10 Diamond | 14000 |
There are pictures of Moh’s scientific instruments on the phase transformations group web page. Prof. Harry Bhadeshia photographed the equipment which is on display in Graz.
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Filed under: Hardness, Material, materials science, metallurgy, Rocks |
Its hard to make a comment on this.
Heh, I wanted to compare other hardness scales but the table would become too complicated for this format.
I learnt that Mohs’ name has an ‘S’ so it’s Mohs’ hardness rather than Mohs.
A different hardness scale was used in a question on University Challenge last night. Diamond was 1.
Sounds like it was a hard question.
All the people that left comments below me are retarted,why would you leave a comment about a scale!
I saw a paper about the meaning of hardness measurements by Tabor. (He also had a book). Reference is: D. Tabor, A physical meaning of indentation and scratch hardness, British Journal of Physics, Vol 7, p159, May 1956.
Still no idea about hardness scale with diamond as “1”.
i need to know where zinc is on this scale. can anyone help me?