Mohs hardness tester definition: the hardness of minerals The hardness of minerals is called hardness. Two different minerals are generally scribed to each other to compare the relative hardness of minerals. German mineralogist Mohs used this of mutual characterization to select ten minerals as a measure of mineral hardness, called Mohs hardness tester. .The of use is to use stone to scribe each other to compare the hardness. The strength of the characterization is not too big or too small, and moderate is good. For example, a mineral can burn calcite, but not fluorite, its Mohs hardness is between 3 and 4, and so on. Mohs hardness is only relative hardness and is relatively rough. For example, if you choose the seventh type of quartz (its hardness is 7 degrees), you can trace the tile of the product you want to test.There is no proportional relationship between the numbers published in the Mohs hardness table. For example, a feldspar hardness of 6, does not mean that he is twice the hardness of calcite, the size of the number only indicates the hardness ranking.Usage: If there is a mineral of unknown hardness, it can be used to scribe feldspar, but can not score quartz, the hardness of this mineral can be set at 65 degrees. Others can be deduced by analogy. When testing in the field or without the minerals in the above table, you can also use nails or some common tools to identify the hardness of the mineral.Colour:As shownMaterial:orePackage Contents:10 * Grid/boxOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.