gen-briefly-explain-mineral-hardness-and-the-mohs-scale-and-one-2bba

Briefly explain mineral hardness and the Mohs scale and one common misconception about it.

# Mineral Hardness and the Mohs Scale **Mineral hardness** is a mineral's resistance to being scratched. It's determined by which materials can scratch it and which materials it can scratch. **The Mohs scale** (developed by Friedrich Mohs in 1812) ranks minerals from 1-10 based on relative hardness: - 1 = Talc (softest) - 10 = Diamond (hardest) Each mineral on the scale can scratch those below it but not those above it. ## Common Misconception Many people assume the Mohs scale represents **equal intervals** of hardness—that diamond (10) is twice as hard as apatite (5), or that the jump from 9 to 10 equals the jump from 1 to 2. **The reality:** The Mohs scale is *ordinal*, not linear. The actual hardness gaps between numbers vary dramatically. For example, diamond is roughly **4 times harder** than corundum (9), while corundum is only slightly harder than topaz (8). The intervals at the lower end are relatively small, but diamond represents a massive jump in absolute hardness.