Graphite consists of carbon bonded in two-dimensional planes of hexagonal rings. These separate planes can slide over one another. Each carbon atom is bonded to three other carbon atoms. Diamond...
Graphite is made up of carbon atoms in a (semi-flat) 6 ring structure. These rings interconnect to form a type of 'honeycomb' sheets. The bonds within the rings are very strong but not as strong...
Graphite's carbon atoms will become more compact, and the density will increase to that of diamond. Both are made of carbon atoms, but different densities.
By the way, I am answering the exact same...