https://doi.org/10.1351/goldbook.N04193
All varieties of solids consisting mainly of the element carbon with two-dimensional long-range order of the carbon atoms in planar hexagonal networks, but without any measurable crystallographic order in the third direction (c-direction) apart from more or less parallel stacking.
Note:
Some varieties of non-
Some varieties of non-
graphitic carbon (graphitizable carbon)
convert on heat treatment to graphitic carbon (graphitizable carbon)
but some others do not (non-graphitizable carbon
).See also:
amorphous carbon