Moh’s Scale Mohs Scale of Hardness. Moh’s scale is a relative hardness scale for minerals rating them from 1 to 10. The values are not proportional. Diamond is rated a 10 and is the hardest mineral and Talc is rated 1 and is the softest. Moh's Scale of Relative Hardness NameImage 1. Talc 2. Gypsum 3. Calcite 4. Fluorite 5. Apatite 6. Orthoclase Feldspar 7. Quartz 8. Topaz 9. Corundum 10. Diamond