Question

Why Diamond, graphite and fullerenes arecrystalline forms of carbon

Answer 1

Graphite is one of three forms of crystalline, or crystal-forming, carbon. Carbon also exists in an amorphous, or “shapeless,” form in substances such as coal and charcoal. ... Besides graphite, the other allotropes of crystalline carbon are diamond and fullerenes. All three forms exist as crystals rather than molecules.

Answer 2

because both diamond graphite and Fullerenes made from corbon but in the property of carbon

having different structure that's why they are differentarecrystalline forms of carbon