{"id":6878,"date":"2026-06-30T11:23:37","date_gmt":"2026-06-30T04:23:37","guid":{"rendered":"https:\/\/giaanh.vn\/?post_type=blog&p=6878"},"modified":"2026-07-16T15:58:37","modified_gmt":"2026-07-16T08:58:37","slug":"how-to-convert-mohs-hardness-scale-to-hv","status":"publish","type":"blog","link":"https:\/\/giaanh.vn\/en\/blog\/how-to-convert-mohs-hardness-scale-to-hv\/","title":{"rendered":"How to Convert Mohs Hardness Scale to HV"},"content":{"rendered":"

BASIC MOHS HARDNESS SCALE<\/strong><\/h2>\n

The table below shows the Mohs hardness scale of the 10 fundamental minerals.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Mohs Hardness<\/td>\nMineral<\/td>\nChemical Formula<\/td>\nAbsolute Hardness<\/td>\n<\/tr>\n
1<\/td>\nTalc<\/td>\nMg3<\/sub>SiO4<\/sub>O10<\/sub>(OH)2<\/sub><\/td>\n1<\/td>\n<\/tr>\n
2<\/td>\nGypsum<\/td>\nCaSO4<\/sub>.2H2<\/sub>O<\/td>\n2<\/td>\n<\/tr>\n
3<\/td>\nCalcite<\/td>\nCaCO3<\/sub><\/td>\n3<\/td>\n<\/tr>\n
4<\/td>\nFluorite<\/td>\nCaF2<\/sub><\/td>\n4<\/td>\n<\/tr>\n
5<\/td>\nApatite<\/td>\nCa5<\/sub>(PO4<\/sub>)3<\/sub><\/td>\n5<\/td>\n<\/tr>\n
6<\/td>\nOrthoclase<\/td>\nKAlSi3<\/sub>O8<\/sub><\/td>\n6<\/td>\n<\/tr>\n
7<\/td>\nQuartz<\/td>\nSiO2<\/sub><\/td>\n7<\/td>\n<\/tr>\n
8<\/td>\nTopaz<\/td>\nAl2<\/sub>SiO4<\/sub>(OH-,F-)2<\/sub><\/td>\n8<\/td>\n<\/tr>\n
9<\/td>\nCorundum<\/td>\nAl2<\/sub>O3<\/sub><\/td>\n9<\/td>\n<\/tr>\n
10<\/td>\nDiamond<\/td>\nC<\/td>\n10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Interesting fact: A human fingernail has a hardness of approximately 2.5; a copper coin 3.5; a knife blade 5.5; window glass 5.5; and a steel file about 6.5. Using materials with known hardness values allows us to accurately determine the relative hardness of an unknown material on the Mohs scale.<\/p>\n

Modified Mohs Hardness Scale<\/strong><\/h2>\n

The Modified Mohs Hardness Scale was introduced by the Mineralogical Society of America to classify materials whose hardness falls between the standard reference minerals.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Modified Hardness Scale<\/td>\nMineral \/ Material<\/td>\n<\/tr>\n
1<\/td>\nTalc<\/td>\n<\/tr>\n
2<\/td>\nGypsum<\/td>\n<\/tr>\n
2.5\u20133<\/td>\nGold, Silver<\/td>\n<\/tr>\n
3<\/td>\nCalcite, Copper<\/td>\n<\/tr>\n
4<\/td>\nFluorite<\/td>\n<\/tr>\n
4\u20134.5<\/td>\nPlatinum<\/td>\n<\/tr>\n
4\u20135<\/td>\nIron<\/td>\n<\/tr>\n
5<\/td>\nApatite<\/td>\n<\/tr>\n
6<\/td>\nOrthoclase<\/td>\n<\/tr>\n
6.5<\/td>\nPyrite (Iron Pyrite)<\/td>\n<\/tr>\n
6\u20137<\/td>\nGlass (Pure Silica)<\/td>\n<\/tr>\n
7<\/td>\nQuartz<\/td>\n<\/tr>\n
7\u20138<\/td>\nHardened Steel<\/td>\n<\/tr>\n
8<\/td>\nTopaz<\/td>\n<\/tr>\n
9<\/td>\nCorundum<\/td>\n<\/tr>\n
10<\/td>\nGarnet<\/td>\n<\/tr>\n
11<\/td>\nZirconia Compound<\/td>\n<\/tr>\n
12<\/td>\nAlumina Compound<\/td>\n<\/tr>\n
13<\/td>\nSilicon Carbide<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Note:<\/strong> The Mohs Hardness Scale is a relative, non-linear scale<\/strong>. This means that the actual difference in hardness between two consecutive reference minerals is not uniform across the scale. For example, the hardness difference between Corundum<\/strong> and Diamond<\/strong> is significantly greater than the difference between Talc<\/strong> and Corundum<\/strong>.<\/p>\n

REFERENCE HV TO MOHS HARDNESS CONVERSION CHART<\/h2>\n

\"\"<\/strong><\/p>\n

Summary:<\/strong><\/p>\n

The Mohs Hardness Scale<\/strong>, widely used in Gemology<\/strong> and Mineralogy<\/strong>, was introduced in 1822 by the German mineralogist Friedrich Mohs<\/strong>. He selected ten common minerals with varying hardness levels that were readily available in high purity. These ten minerals were arranged in ascending order of hardness and assigned values from 1 to 10<\/strong>.<\/p>\n

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