What type of solid is graphite and how does its structure contribute to its unique properties?

Graphite is a crystalline solid that belongs to the allotrope of carbon. Its structure consists of layers of carbon atoms arranged in a hexagonal lattice. These layers are held together by weak van der Waals forces, allowing them to easily slide over each other. This unique structure gives graphite its lubricating properties, electrical conductivity, and ability to be used as a dry lubricant and in pencil lead.