The Mohs scale can be misleading -- there is a much greater difference in hardness between 9 (corundum) and 10 (diamond) than between 9 and 1 (talc).
(The Mohs scale; can be misleading; there is a much greater difference in hardness between 9 (corundum) and 10 (diamond) than between 9 and 1)
The Mohs scale
can be misleading
there is a much greater difference in hardness between 9 (corundum) and 10 (diamond) than between 9 and 1