Citation:
Anthracite coal is the highest-ranked type of coal, characterized by its high carbon content, low moisture content, and excellent heat-producing properties. It burns cleanly and efficiently, making it ideal for residential heating.
A lower-ranked type of coal that falls between sub-bituminous and anthracite in terms of carbon content.
Sub-bituminous coal: A lower-ranked type of soft black or brownish-black sedimentary rock with a higher moisture content than anthracite.
Peat: An early stage in the formation of fossil fuels, consisting mainly of partially decomposed plant material.