Rosiwal scale
The Rosiwal scale is a hardness scale in mineralogy, with its name given in memory of the Austrian geologist August Karl Rosiwal. The Rosiwal scale bases its measure on absolute values, unlike the Mohs scale whose values are relative values, its interest is relegated to the amateur or an approach that makes it useful in the research field.
The Rosiwal method is basically a method of petrographic analysis and led to the development of the stereograph.Rosiwal scale values
| Valor MOHS | Mineral | Rosiwal value | Rosiwal value | Rosiwal value | Rosiwal value | Rosiwal value | Rosiwal value | Rosiwal value | Chemical
composition |
| Hardness | Mineral | 1 | 10 | 100 | 1,000 | 10,000 | 100,000 | 1,000,000 | Chemical
composition |
| 1 | Talc | **** | | | | | | | Mg3Si4O102 |
| 2 | Plaster | ***** | * | | | | | | CaSO4 · 2H2O |
| 3 | Calcite | ***** | ***** | | | | | | CaCO3 |
| 4 | Fluorite | ***** | ***** | | | | | | CaF2 |
| 5 | Apatite | ***** | ****** | | | | | | Ca53 |
| 6 | Feldspar | ***** | ***** | **** | | | | | KAlSi3O8 |
| 7 | Quartz | ***** | ***** | ***** | * | | | | SiO2 |
| 8 | Topaz | ***** | ***** | ***** | *** | | | | Al2SiO42 |
| 9 | Corundum | ***** | ***** | ***** | ***** | | | | Al2O3 |
| 10 | Diamond | ***** | ***** | ***** | ***** | ***** | ***** | ** | C |
Measures in an absolute scale the hardness of minerals expressed as abrasion's resistance, measured at laboratory, starting with corundum with a base value of 1000.
Other scale
The Rosiwal scale is used in mineralogy in the same way as Mohs scale and Knoop scale.
