carbon nanotube
Structure of a (7,1) (single-wall) carbon nanotube looking along the tube axis. The golden spheres represent carbon atoms and the bonds between them are marked by connecting lines.
(Further reading: S. Heinze, J. Tersoff, and Ph. Avouris, Carbon Nanotube Electronics and Optoelectronics, Lecture Notes in Physics 680, 381 (2005).)

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