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Mohs hardness scale

grad of hardness mineral formula
1 Talk Mg3[(OH)2/Si4O10]
2 Gips CaSO4*2H2O
3 Kalkspat CaCO3
4 Flußspat CaF2
5 Apatit Ca5[(F,Cl,OH)/(PO4)2]
6 Feldspat KAlSi3O8
7 Quarz SiO2
8 Topas Al2[F2/SiO4]
9 Korund Al2O3
10 Diamant C

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