Graphite

A STM image of graphite.
The hexagonal unit cell of graphite has two atoms in its basis but STM only shows one of the two, forming a triangular lattice
B AFM image of graphite. The hexagonal carbon rings are visible, and the complete surface lattice is imaged
(image credit: S Hembacher et al 2003 Proc. Nat. Acad. Sci.)

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