Pokropivny, V. V. and A. V. Pokropivny (2004). "Structure of "Cubic Graphite": Simple Cubic Fullerite C24." Physics of the Solid State 46(2): 392-394.

The structure of an intermediate carbon phase, the so-called "cubic graphite," is determined. Close agreement between the calculated and experimental lattice constants (A = 0.5545 nm), densities (p = 2.80 g/cm 3), and all lines of the Debye powder pattern indicates that cubic graphite has a simple cubic lattice formed by C24 fullerene molecules copolymerized by the square faces.

http://dx.doi.org/10.1134/1.1649442