- Graphite.5-1.0
- Talc1.0
- Asphalt1.0-2.0
- Tin1.5
- Lead1.5
- Aluminum, element2.0
- Bismuth2.5
- Zinc2.5
- Gold, 24K2.5-3.0
- Silver2.5-3.0
- Mica2.5-4.0
- Copper, element2.5-5.0
- Antimony3.0
- Brass3.0-4.0
- Marble3.0-4.0
- Phosphor Bronze4.0
- Iron, element4.0-5.0
- Platinum, element4.3
- Glass2.72
- Iridium, element6.0
- Tantalum6.0-6.5
- Garnet6.5-7.0
- Quartz7.0
- Zircon7.5
- Topaz8.0
- Sapphire9.0
- Silicon Carbide9.0
- Corundum9.0
- Diamond10.0