AM_Carbon_6
Formula: C7
Name: Carbon
Unit cell: 2.5221 2.5221 43.245 90.0 90.0 120.0 , V=238.23
Space group: R-3M (166)

Ownby P D , Yang X , Liu J , Journal of the American Ceramic Society , 75 (1992) p.1876-1883, Calculated X-ray diffraction data for diamond polytypes, Note: rhombohedral, 21R structure, Note: theoretically calculated structure values