II · Reading the Plate Absolute Hardness · Vickers, kg/mm²
Specimen Study No. 04 — The Ordinal Lie

The steps look even on paper. The diamond disagrees.

1 10 100 1000 1 Talc 1 2 Gypsum 3 3 Calcite 9 4 Fluorite 21 5 Apatite 48 6 Feldspar 72 7 Quartz 100 8 Topaz 200 9 Corundum 400 10 Diamond 1,500 3.75× one step
Source: Mohs reference set, 1812 · absolute values after Rosiwal abrasion, kg/mm² Mineralia· Pl. 04 / 10
This is the Mohs Hardness Scale design system, applied by Curio Design — a design-style library for AI agents. Full Mohs Hardness Scale guide → designbycurio.com/learn/mohs-hardness-scale-plate