Mohs hardness(Mohs Hardness)Mohs hardness, meansMineral hardnessA standard ofFrederick Mossto1822Firstly, it is proposed that the surface of the tested mineral is scratched by the nicking methodhardness。Mohs hardness is not absoluteHardness value, but according to the hardnessorderThe value represented by.
Tool for measuring Mohs hardness: Mohs hardness pen
Mohs hardness refers to the hardness expressed by ten grades of the measured scratches on the surface of the tested mineral, which is relatively rough.The hardness of the tested mineral is determined by comparing it with the ten reference minerals. If a reference mineral can scratch the tested mineral, it means that the Mohs hardness is less than the reference mineral. If it cannot be engraved, it means that the Mohs hardness is greater than the reference mineral.
history
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In 1722, R.A.F.de Leomir of France first proposed the very rough scratch hardness measurement method.This method is to use an appropriate force to make the tested material scratch on a metal bar that gradually changes from hard at one end to soft at the other end, and determine the hardness of the tested material according to the position of the scratch on the bar.
In 1822, F. Moss took the scratch hardness of ten minerals as the standard and determined ten hardness grades, called Mohs hardness.Among the ten kinds, diamond is the hardest and talc is the softest.The Mohs hardness standard is arbitrarily determined and cannot be accurately used to determine the hardness of materialsMicrohardness testerMeasuredAbsolute hardnessThe actual hardness difference between Grade 10 and Grade 9 is much greater than that between Grade 2 and Grade 1.
Reference minerals
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Mohs hardness reference mineral
Mohs hardness is determined by comparing with ten reference minerals, which are as follows:
