Diamond is the allotrope of carbon in which the carbon atoms are arranged in the specific type of cubic lattice called diamond cubic. It is a crystal that is transparent to opaque and which is general
An octahedral diamond crystal in matrix
Diamonds in an angle grinder blade
Synthetic diamonds of various colors grown by the high-pressure high-temperature technique. The diamond size is ~2 mm.
Pure diamonds, before and after irradiation and annealing. Clockwise from left bottom: 1) initial (2 mm × 2 mm); 2–4) irradiated by different doses of 2 MeV electrons; 5–6) irradiated by different doses and annealed at 800 °C.
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.