Graphite is soft and lubricant, extremely difficult to melt. The reason for this anomalous behavior is that graphite
has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interpellate bonds
is a non-crystalline substance
is an allotrope form of carbon
has molecules of variable molecular masses like polymers
graphite has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interpellate bonds