Mohs scale o meeneral haurdness

The Mohs scale o mineral haurdness chairacterizes the scratch reseestance o sindry minerals throu the ability o a haurder material tae scratch a safter material. It wis creatit in 1812 bi the German geologist an mineralogist Friedrich Mohs an is ane o several defineetions o haurdness in materials science.^[1] The method o comparin haurdness bi seein which minerals can scratch ithers, houever, is o great antiquity, haein been mentioned bi Theophrastus in his treatise On Stones, c. 300 BC, follaed bi Pliny the Elder in his Naturalis Historia, c. 77 AD.^[2][3][4]

1. ↑ Encyclopædia Britannica. 2009. Encyclopædia Britannica Online. 22 Feb. 2009 "Mohs hardness."
2. ↑ Theophrastus on Stones. Farlang.com. Retrieved on 2011-12-10.
3. ↑ Pliny the Elder. Naturalis Historia. Book 37. Chap. 15. ADamas: six varieties of it. Two remedies.
4. ↑ Pliny the Elder.Naturalis Historia. Book 37. Chap. 76. The methods of testing precious stones.