Was sind die zehn härtesten Steine?

2. Moissanit (Mohs Härte:9.5)

3. corundum (Mohs Härte:9)

4. Topaz (MOHS -Härte:8)

5. Beryl (MOHS -Härte:8)

6. Quarz (MOHS -Härte:7)

7. Orthoklas Feldspar (MOHS -Härte:6)

8. Plagioklasfeldspat (MOHS -Härte:6)

9. hornblende (MOHS -Härte:6)

10. Augite (MOHS-Härte:5.5-6)