Graphite (C)

About

Carbon in flat hexagonal sheets, each atom bonded to three neighbours (1.42 Å). The layers stack ABAB and are held together only by weak van der Waals forces 3.35 Å apart — why graphite cleaves and conducts in-plane.

Structure

Elements

Also crystallizes this way

Sources

• Structure: Crystallography Open Database (COD)
• Lattice parameters: Wyckoff, Crystal Structures — a = 2.461 Å, c = 6.708 Å