Is diamond the hardest material?

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Tags

1. #wurtzite
2. #conditions
3. #lonsdaleite
4. #diamond
5. #hexagonal
6. #shape
7. #structure
8. #boron
9. #arranged
10. #first
11. #extreme
12. #mineral
13. #second
14. #atoms
15. #similar
16. #carbon
17. #nitride
18. #different