1. Wurtzite Boron Nitride
2. Lonsdaleite (Hexagonal Diamond)
3. Diamond
4. Borazon (Cubic Boron Nitride)
5. Rhenium Diboride
6. Titanium Carbide
7. Titanium Diboride
8. Zirconium Carbide
9. Boron Carbide
10. Alumina
Source: http://realitypod.com/2011/08/top-10-hardest-materials/
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