The cubic lattice parameter value a = 1.41568 +/- 0.00006 nm of large size C-60 single crystal has been measured and Debye temperature T-D = 53.9 K from the X-ray scattering spectrum at a fixed temperature was obtained. The microhardness and dislocation structure of the crystals was examined. (C) 2002 Elsevier Science B.V. All rights reserved.