Carbon Bucknum M J, Castro E A Journal of Chemical Theory and Computation 2 (2006) 775-781 The carbon allotrope hexagonite and its potential synthesis from cold compression of carbon nanotubes Locality: hypothetical structure _database_code_amcsd 0013020 4.89 4.89 3.88 90 90 120 P6/mmm atom x y z C1 2/3 1/3 .1840 C2 .5 .5 .3400