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Allotrope is the ability of a chemical to exhibit a number of different and physically distinct forms in its pure elemental state. The element carbon displays many allotropic forms, 8 of which are displayed here. They are (a) diamond, (b) graphite, (c) lonsdaleite, (d) buckminsterfullerene, (e) C540, (f) C70, (g) amorphous carbon and (h) a single walled carbon nanotube.