 | Adolphe Ganot - 1879 - 1000 pages
...to a scale of hardness : that usually adopted is — 1. Talc 2. Rock salt 3. Calcspar 4. Fluorspar 5. Apatite 6. Felspar 7. Quartz 8. Topaz 9. Corundum 10. Diamond Thus, the hardness of a body which would scratch felspar, but would be scratched by quartz, would be... | |
 | Ontario. Department of Mines, Ontario. Bureau of Mines - 1896 - 740 pages
...degrees of hardness are made use of as follows : ness1. Talc. 2. Gypsum. 3. Calcite. 4. Fluorspar. 5. Apatite. 6. Felspar. 7. Quartz. 8. Topaz. 9. Corundum. 10. Diamond. If a mineral scratches and is scratched by calcite, its hardness is said to be 3. If it is softer than... | |
 | Ontario. Legislative Assembly - 1897 - 842 pages
...degrees of hardness are made use of as follows : ne88> 1. Talc. 2. Gypsum. 3. Calcite. 4. Fluorspar. 5. Apatite. 6. Felspar. 7. Quartz. 8. Topaz. 9. Corundum. 10. Diamond. If a mineral scratches and is scratched by calcite, its hardness is said to be 3. If it is softer than... | |
 | Alan Edward Munby - 1909 - 358 pages
...increasing order of hardness. These minerals are as follows :—1 talc, 2 selenite, 8 calcite, 4 fluorspar, 5 apatite, 6 felspar, 7 quartz, 8 topaz, 9 corundum, 10 diamond. The statement, then, that the hardness of a mineral is, for example, 7, means that it has the hardness... | |
| |
Calcite. 4. Fluorspar. 5. Apatite. 6. Felspar. 7. Quartz. 8. Topaz. 9. Corundum. 10. Diamond. 