MOH's scale of Mineral Hardness
Hardness Mineral Chemical Composition
1. Talc Mg3Si4O10(OH)2
2. Gypsum CaSO42H2O
3. Calcite CaCO3
4. Fluorite CaF2
5. Apatite Ca5(PO4)3(OH-,Cl-F-)
6. Orthoclase KAlSi3O8
7. Quartz SiO2
8. Topaz Al2SiO4(OH-,F-)2
9. Corundum Al2O3
10. Diamond C
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