Stone Hardness refers to the ability for stone to invade other objects machinery.It is related to mineral composition, structure, construction.Stone Hardness is usually divided into the relative hardness and absolute hardness.Relative hardness take 10 kinds of minerals as a standard according to the size of the relative hardness into 10 levels.Relative hardness developed by the mineralogist Moore.As a result,the relative hardness is called Mohs hardness.Mohs hardness does not have a strict quantitative criteria.Therefore,it is less used in analisis of stone functions.But because the Mohs hardness is easy to use, it is used to roughly determine the type of rock or mineral species in the absence of special equipment.Absolute Hardness is measures with hardness durometer.According to the measured way of applying a load, hardness can be divided into static and dynamic hardness.HK and HV were expressed with symbols respectively.
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