Due to the wide variety in the composition of coal, its position on the Mohs hardness would vary based on the type of coal that is measured. However, because coal is not a mineral,...
The Mohs scale of mineral hardness is a qualitative ordinal scale that
characterizes the scratch resistance of various minerals through the ability of a
The most commonly used test of mineral hardness is Mohs Hardness Scale.
In 1812 the Mohs scale of mineral hardness was devised by the German
mineralogist Frederich Mohs (1773-1839), who selected the ten minerals
because they ...
The Mohs scale
is strictly a relative scale
, but that's all that anyone needs. In terms of absolute hardness
, diamond (hardness
10) actually is 4 times harder than corundum (hardness
9) and 6 times harder than topaz (hardness
8). A fingernail is 2½, a penny (actually,... More »
The Mohs' hardness scale was developed in 1822 by Frederich Mohs. This scale
is a chart of relative hardness of the various minerals (1 - softest to 10 ...
Mohs hardness, rough measure of the resistance of a smooth surface to
scratching or abrasion, expressed in terms of a scale devised (1812) by the
How to conduct a hardness test on an unknown rock or mineral using Mohs
Scale of hardness.
The Mohs scale of mineral hardness characterizes the scratch resistance of
various minerals through the ability of a harder material to scratch a softer
This scale, which ran from 1 to 10, was named after Mohs, and is known as the
Mohs Hardness Test. (Hardness should not be confused with brittleness.