The scale is not linear, and isn't too precise when measuring the hardness of certain industrial materials.
Hardness
The Mohs scale uses the hardness of minerals to classify them from 1 to 10. It was named after the German geologist Carl Friedrich Christian Mohs.
Relative hardness is the property of minerals that uses the Mohs scale for classification.
The hardness of Limonite is 4 t0 5.5 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
Diatomite has a hardness of around 5.5 on the Mohs scale of hardness.
The Mohs scale is used to determine the relative hardness of minerals.
Dolomite has a hardness of 3.5-4 on the Mohs scale of hardness.
It's called the Ore
Pumice has a hardness of about 6 on the Mohs scale of mineral hardness.
Azurite has a hardness of 3.5 to 4 on the Mohs hardness scale.
the hardness of Topaz is 8 on moes hardness scale