Fullerene is a crystalline allotropic form of Carbon.
It has 60 Carbon atoms arranged in the form of a hollow structure that appears like a football.
The property of an element due to which it exists in different physical forms which have identical chemical properties but different physical properties is called as allotropy. The different physical forms of that element are called as allotropes. Example: Carbon is an element that shows the property of allotropy because it exists in different physical forms that have identical chemical properties but different physical properties.
Crystalline allotropes are those in which the constituent particles are arranged in a particular pattern. Example: diamond, graphite, fullerene