Mohs scale of mineral hardness finding the hardest material that the given material can scratch, or the softest material that can scratch the given material. For example, if some material is scratched by apatite but not by fluorite, its hardness on the Mohs scale would fall between 4 and 5. "Scratching" a material for the purposes of the Mohs scale means creating non-elastic dislocations visible to the naked eye. Frequently, materials that are lower on the Mohs scale can create microscopic, non-elastic dislocations on materials that have a higher Mohs number. While these microscopic dislocations are permanent and sometimes detrimental to the harder material's structural
Ichalkaranji are used in engineering and other manufacturing industries, engineering institutes and research institutes for analysis. These measuring instruments are marketed in India as well as some other countries. Measuring instruments manufactured in city by varies companies include compression testing machines, torsion testing machines, horizontal chain and rope testing machines, spring testing machine, impact testing machine, Erichsen testing machines, universal testing machines, Rockwell scale hardness tester, Brinell scale hardness tester, and computerised Vickers hardness test. The city's economy. driven by the engineering goods manufacturing industry (which has been around since the 1950s). Several automotive component manufacturers have plant's in or around