Buckminsterfullerene is an allotropic form of the element:
The crystalline allotrope of carbon is fullerene. The best-known fullerene is Buckminsterfullerene, that consists of 60 carbon atoms joined together in a series of 5- and 6- membered to form a spherical molecule resembling a soccer ball. So its formula is C-60.
This allotrope was named as Buckminsterfullerene after the American architect.