In the structure of graphite, only out of electrons are involved in the bond formation (covalent bond), due to this the properties of graphite are affected.
Graphite is soft and slippery because it has a layered structure, because of which they could slide over each other.
The bond is broken easily because of the weak force of attraction and hence they slide over each other.
This results in the slipperiness of graphite.
Due to this reason, it is used as a lubricant in industries.
