This method is based on the mutual characterization of the gem minerals and standard hardness minerals to be measured. In 1982, the German mineralogist Moss proposed ten standard hardness minerals with the following grades: talc-1, gypsum-2, calcite-3, fluorite-4, apatite-5, orthoclase-6, Quartz-7, Topaz-8, Corundum-9, Diamond-10. This standard is the Mohs hardness tester. In fact, the difference in hardness between adjacent minerals is not the same, but the difference in hardness between diamond and corundum is the greatest.

The FMH-5 Mohs hardness pen is based on the five minerals of apatite-5, orthoclase-6, quartz-7, topaz-8, and corundum-9 in the Mohs hardness tester. , use these ore's edges and corners to trace the sample to be tested, and determine the hardness of the tested sample according to whether or not there are scratches on the sample: if scratches are left, the hardness of the sample is lower than the hardness of the hardness pen, if it does not move, This indicates that the hardness of the sample is higher than the hardness of the hardness pen.

1----TALC
2----GYPSUM
3----CALCITE
4----FLUORITE
5----APATITE
6----ORTHOCLASE
7----QUARTZ
8----TOPAZ
9----CORUNDUM
10--DIAMOND

How to use:
  1. First indirectly estimate the hardness of the sample.
  2. Find an inconspicuous place, scribe the sample with a hardness pen that is lower than the visual hardness 1 to 2 levels. If the stroke does not move, then the hardness of the sample is higher than the hardness of the hardness pen, and then use a high-grade hardness engraved Scratches, repeat operations, if only slight traces, indicating that the hardness of the sample and the hardness of the hardness of the pen is equal to the hardness of the pen, and then repeated the operation, if left scratches, indicating that the hardness of the sample is lower than the hardness The hardness of the pen, at this point can determine the hardness of the sample or its range.
  3. Note that the grading intensity should be moderate, neither too light nor too heavy.

Country of origin: China