Ποιοι είναι οι δέκα πιο σκληροί βράχοι;

1. Diamond (Mohs Hardness:10)

2. moissanite (Mohs Hardness:9.5)

3. Corundum (Mohs Hardness:9)

4. Topaz (Mohs Hardness:8)

5. Beryl (Mohs Hardness:8)

6. χαλαζία (Mohs Hardness:7)

7. (Mohs Hardness:6)

8. (Mohs Hardness:6)

9. Hornblende (Mohs Hardness:6)

10. augite (Mohs Hardness:5.5-6)