Mohs scale o mineral hardness
The Mohs scale o mineral hardness characterizes the scratch resistance o various minerals through the ability o a harder material tae scratch a safter material. It wis created in 1812 bi the German geologist an mineralogist Friedrich Mohs an is ane o several defineetions o hardness in materials science. The method o comparin hardness bi seein which minerals can scratch ithers, however, is o great antiquity, havin been mentioned bi Theophrastus in his treatise On Stones, c. 300 BC, follaed bi Pliny the Elder in his Naturalis Historia, c. 77 AD.
References[eedit | eedit soorce]
- Encyclopædia Britannica. 2009. Encyclopædia Britannica Online. 22 Feb. 2009 "Mohs hardness."
- Theophrastus on Stones. Farlang.com. Retrieved on 2011-12-10.
- Pliny the Elder. Naturalis Historia. Book 37. Chap. 15. ADamas: six varieties of it. Two remedies.
- Pliny the Elder.Naturalis Historia. Book 37. Chap. 76. The methods of testing precious stones.