Diamond is a compound of carbon which is alike solid, with its atoms organized in an exceedingly crystal structure referred to as diamond cubical. At temperature and pressure, another solid sort of carbon referred to as carbon is that the with chemicals stable kind, however diamond virtually ne'er converts thereto. Diamond has the very best hardness and thermal physical phenomenon of any natural material, properties that square measure utilised in major industrial applications like cutting and sharpening tools. They're conjointly the explanation that diamond anvil cells will subject materials to pressures found deep within the Earth. Because the arrangement of atoms in diamond is extraordinarily rigid, few sorts of impurity will contaminate it (two exceptions being atomic number 5 and nitrogen) there are always found some few numbers of impurities and defects which are about one per million of lattice atoms, colour diamond blue (boron), yellow (nitrogen), brown (defects), inexperienced (radiation exposure), purple, pink, orange or red. Diamond conjointly has comparatively high optical dispersion (ability to disperse lightweight of various colours).
Most natural diamonds have ages between 1 billion and 3.5 billion years. Most were shaped at depths between a hundred and fifty and 250 kilometres (93 and one hundred fifty-five mi) within the Earth's mantle, though many have come back from as deep as 800 kilometres (500 mi). Beneath air mass and temperature, carbon-containing fluids dissolved minerals and replaced them with diamonds. Rather more recently (tens too many million years ago), they were carried to the surface in volcanic eruptions and deposited in igneous rocks referred to as kimberlites and lamproites. Synthetic diamonds may be full-grown from high-purity carbon beneath high pressures and temperatures or from organic compound gas by chemical vapour deposition (CVD). Imitation diamonds may also be created out of materials like cubical oxide and carbide. Natural, artificial and imitation diamonds square measure most typically distinguished mistreatment optical techniques or thermal physical phenomenon measurements.
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