The Mohs Scale: Measuring Mineral Hardness from Talc to Diamond

For over two centuries, diamond has sat unchallenged at the apex of mineral hardness. However, in early 2025, Chinese scientists successfully synthesized a hexagonal "super diamond" (lonsdaleite) that is theorized to withstand 58% more stress than standard cubic diamonds. While the frontier of material science pushes past natural limits, the foundational metric used to rank these materials remains surprisingly unchanged. Invented in 1812, the Mohs Scale of Mineral Hardness continues to be the ultimate benchmark for geologists, miners, and gemologists. Instead of complex chemical classifications, it relies on a simple, observable physical property: scratch resistance.