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Template:THANKSALOT Invented by German geologist Friedrich Mohs, the Mohs Hardness Scale is used in geology to measure the hardness of a rock or mineral. The higher on the scale a material is, the harder it is. Any material that has a certain number on the Mohs scale can scratch any specimen with a smaller number, but can be scratched itself by a another specimen of the same type or with a higher number. The $ 10 $ classical exemplars are listed here, with a few notable objects in between for the purpose of comparison.

Scale

Number and corresponding substance
1
2
2.3
2.5
3
3.5
4
5
6
7
7.7
7.7777
8
9
9.5
9.9
[1]

References

  1. http://onlinelibrary.wiley.com/doi/10.1002/adfm.200901257/abstract;jsessionid=65D24AB44D9A369575A605BD54E38101.f04t01?systemMessage=Wiley+Online+Library+is+migrating+to+a+new+platform+powered+by+Atypon%2C+the+leading+provider+of+scholarly+publishing+platforms.+The+new+Wiley+Online+Library+will+be+migrated+over+the+weekend+of+February+24+and+25+and+will+be+live+on+February+26%2C+2018.+For+more+information%2C+please+visit+our+migration+page%3Ahttp%3A%2F%2Fwww.wileyactual.com%2FWOLMigration%2F