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is the defining attribute of a substance
A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions. Chemical compounds have a unique and defined chemical structure; they consist of a fixed ratio of atoms that are held together...
rich in carbon
Carbon is the chemical element with symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds...
. Particularly, carbonaceous hydrocarbon
In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Hydrocarbons from which one hydrogen atom has been removed are functional groups, called hydrocarbyls....
are very unsaturated
In chemistry, saturation has six different meanings, all based on reaching a maximum capacity...
, high-molecular-weight hydrocarbons, having an elevated carbon:hydrogen
Hydrogen is the chemical element with atomic number 1. It is represented by the symbol H. With an average atomic weight of , hydrogen is the lightest and most abundant chemical element, constituting roughly 75% of the Universe's chemical elemental mass. Stars in the main sequence are mainly...
Metamorphism of the carbonaceous material is expressed in the graphitisation process. However, graphitisation may be accelerated or retarded in dependence on various metamorphic or lithological factors involved.