[File:Eight Allotropes of Carbon.png|300px|thumb|right|Eight allotropes of carbon: a) diamond, b) graphite, c) lonsdaleite, d) C₆₀ buckminsterfullerene, e) C₅₄₀, Fullerite f) C₇₀, g) amorphous carbon, and h) single-walled carbon nanotube.]]