Friedrich Mohs created it
It's called the Ore
Diatomite has a hardness of around 5.5 on the Mohs scale of hardness.
The hardness of Limonite is 4 t0 5.5 on the mohs hardness scale.
Azurite has a hardness of 3.5 to 4 on the Mohs hardness scale.
flint is a type of quartz, so it has a hardness of about 7 on the mohs scale of hardness
The Mohs hardness scale is named after Friedrich Mohs, a German geologist and mineralogist who created the scale in 1812. It is used to determine the relative hardness of minerals by their ability to scratch each other.
Nickel has a hardness of 4 on the Mohs scale.
The hardness is 3-4 on Mohs scale.
Dolomite has a hardness of 3.5-4 on the Mohs scale of hardness.
The Mohs scale is used to determine the relative hardness of minerals.
Aluminum Oxide is roughly 8.5 - 9.0 on the hardness scale.
This scale was proposed by the Austrian geologist Friderich Mohs.