| 1 | A | B | C | D | E |
| --- | --- | --- | --- | --- | --- |
| 2 | Scratch hardness |  |  |  |  |
| 3 | Material | Material | Mohs' scale | Ridgway's scale | Wooddell's scale |
| 4 | talc | talc | 1 | 1 | - |
| 5 | gypsum | gypsum | 2 | 2 | - |
| 6 | calcite | calcite | 3 | 3 | - |
| 7 | fluorite | fluorite | 4 | 4 | - |
| 8 | apatite | apatite | 5 | 5 | - |
| 9 | orthoclase | orthoclase | 6 | 6 | - |
| 10 | vitreous silica | vitreous silica | - | 7 | - |
| 11 | quartz | quartz | 7 | 8 | 7 |
| 12 | topaz | topaz | 8 | 9 | - |
| 13 | garnet | garnet | 8.92 | 10 | - |
| 14 | corundum | corundum | 9 | - | 9 |
| 15 | fused zirconia | fused zirconia | - | 11 | - |
| 16 | fused alumina | fused alumina | 9.03–9.065 | 12 | 10 |
| 17 | tungsten carbide | tungsten carbide | 9.09 | - | 12.0 |
| 18 | silicon carbide | silicon carbide | 9.13–9.17 | 13 | 14.0 |
| 19 | boron carbide | boron carbide | 9.32 | 14 | 19.7 |
| 20 | diamond | carbonado | 9.82 | 15 | 36.4 |
| 21 | diamond | ballas | 9.99 | 15 | 42.0 |
| 22 | diamond | bort | 10 | 15 | 42.4 |

Question: What are Wooddell's scale values for quartz, corundum and diamond bort?
Answer: Wooddell's scale value is seven for quartz and nine for corundum, and 42.4 for diamond bort.