Mohs Hardness Scale uses anhydrous minerals, meaning they don't contain water molecules within their crystal structure.

Here are the minerals on Mohs Scale:

1. Talc

2. Gypsum

3. Calcite

4. Fluorite

5. Apatite

6. Orthoclase

7. Quartz

8. Topaz

9. Corundum

10. Diamond

While some minerals can contain water, it's not a defining characteristic for Mohs Hardness.