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Abstract:
C60 crystals were grown from purified powder material with a multiple sublimation technique. In addition to crystals with a cubic close-packed (ccp) arrangement, crystals were found with a hexagonal close-packed (hcp) structure. Detailed crystallograpic evidence is given, including complete refinements, of the room-temperature structures of both polytypes. The radius of the C60 molecule was determined as 3.541(1) Å, and was found to be equal for both ccp and hcp crystals.