The carbon atoms in graphite form a regular hexagonal structure, with each carbon atom bonded to three other carbon atoms in a plane. This structure results in a strong covalent bond between the carbon atoms, which is responsible for graphite's high melting point and electrical conductivity. The bonds between the planes are weak, which allows the planes to slide past each other easily, giving graphite its slippery feel and its ability to be used as a lubricant. The type of bond in graphite is called covalent bonding.