Lonsdaleite
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Lonsdaleite, also called hexagonal diamond in reference to the crystal structure, is an allotrope of carbon with a hexagonal lattice, as opposed to the cubical lattice of conventional diamond. It is f
Diamond samples from the Popigai impact structure: (a) is pure diamond, while (b) is diamond with some lonsdaleite impurities.
Vickers hardness test
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The Vickers hardness test was developed in 1921 by Robert L. Smith and George E. Sandland at Vickers Ltd as an alternative to the Brinell method to measure the hardness of materials. The Vickers test
A Vickers hardness tester
The pyramidal diamond indenter of a Vickers hardness tester
This is a good indentation.