Superhard material
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A superhard material is a material with a hardness value exceeding 40 gigapascals when measured by the Vickers hardness test. They are virtually incompressible solids with high electron density and hi
A nanoindenter, used to measure the hardness and related properties of materials
Diamond and graphite materials and structure
Mohs scale
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The Mohs scale of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.
Superhard material
…hardness was first defined as the ability of one material to scratch another and quantified by an integer (sometimes half-integer) from 0 to 10 on the Mohs scale. This scale was however quickly found too discrete and non-linear. Measuring the mechanical hardness of materials changed to using a nanoindenter…
Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale
Talc block
Gypse Arignac
Calcite sample 2