Graphite Fayos J Journal of Solid State Chemistry 148 (1999) 278-285 Possible 3D carbon structures as progressive intermediates in graphite to diamond phase transition Note: mathematical model, phase: gra_crbl43_ch _database_code_amcsd 0013981 4.700 5.978 4.448 90 90 90 Pcca atom x y z C1 .3613 .2469 .1589 C2 .1614 .1297 .3357