Allotropes of carbon
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Graphite is one of the most common Allotropes of carbon. Unlike diamond, graphite is a conductor, and can be used, for instance, as the material in the electrodes of an electrical arc lamp. Graphite holds the distinction of being the most stable form of solid carbon ever discovered.
Allotropes are different forms of the same element. All elements are made up uniquely of their own atoms and therefore any physical differences must be a consequence of how the atoms are joined together. Many elements show Allotropy as there are often various ways in which the atoms can be linked together and also different ways in which the molecules can be arranged to make larger structures.
Diamond is one of the best known Allotropes of carbon, whose hardness and high dispersion of light make it useful for industrial applications and jewelry. Diamond is the hardest known natural mineral, making it an excellent abrasive and also means a diamond holds its polish extremely well and retains luster.