Mohs Hardness Calculator
Expert Guide to Mohs Hardness Calculation
Introduction & Importance
Mohs scale is a qualitative ordinal scale used to measure the hardness of various minerals through the ability of a harder material to scratch a softer material. Understanding how to calculate the difference in hardness using the Mohs scale is crucial in geology, mineralogy, and material science.
How to Use This Calculator
- Enter the Mohs hardness values for the two materials.
- Click ‘Calculate’.
- View the results and chart below.
Formula & Methodology
The difference in Mohs hardness is calculated by subtracting the lower value from the higher value. The result indicates the relative hardness difference between the two materials.
Real-World Examples
Example 1: Talc vs. Quartz
Talc has a Mohs hardness of 1, and Quartz has a Mohs hardness of 7. The difference is 7 – 1 = 6.
Example 2: Fluorite vs. Topaz
Fluorite has a Mohs hardness of 4, and Topaz has a Mohs hardness of 8. The difference is 8 – 4 = 4.
Example 3: Diamond vs. Corundum
Diamond has a Mohs hardness of 10, and Corundum has a Mohs hardness of 9. The difference is 10 – 9 = 1.
Data & Statistics
| Mineral | Mohs Hardness |
|---|---|
| Talc | 1 |
| Gypsum | 2 |
| Calcite | 3 |
| Fluorite | 4 |
| Apophyllite | 5 |
| Orthoclase | 6 |
| Quartz | 7 |
| Topaz | 8 |
| Corundum | 9 |
| Diamond | 10 |
| Material | Mohs Hardness |
|---|---|
| Talcum Powder | 1 |
| Fingernail | 2.5 |
| Glass | 5.5 |
| Steel | 6.5 |
| Tungsten Carbide | 9 |
Expert Tips
- Always use a clean, sharp tool to test Mohs hardness.
- Be cautious when testing materials with a Mohs hardness close to 10, as they can be dangerous.
- Consider using a Mohs hardness kit for accurate measurements.
Interactive FAQ
What is Mohs hardness?
Mohs hardness is a qualitative ordinal scale used to measure the hardness of various minerals through the ability of a harder material to scratch a softer material.
What is the difference between Mohs hardness and absolute hardness?
Mohs hardness is a qualitative scale, while absolute hardness is a quantitative measure. Mohs hardness is based on scratch resistance, while absolute hardness is based on the amount of force required to break a material.
For more information, see the Gemological Society’s guide to the Mohs scale.