#fixed carbon
- Anthracite — The highest rank of fossil coal, characterized by an extremely high fixed carbon content (92% to 98%), a minimal percentage of volatile matter, and a distinct semi-metallic luster, representing the final stage of coalification.
- Anthracitous — Containing anthracite, possessing the characteristics, appearance, or structural composition of anthracite; a sedimentary rock, schist, or carboniferous deposit rich in highly evolved coal, displaying a discreet semi-metallic luster and high density. In an industrial sense, it describes materials or combustion residues that preserve a high concentration of structurally bound fixed carbon.
- Anthracolitic — Belonging to, referring to, or specific to anthracolite or the geological period of formation of massive superior coal deposits combined with calcareous structures; a sedimentary rock or crystalline formation characterized by intercalations of calcium carbonate and organic fossil inclusions rich in fixed carbon. In a stratigraphic sense, it describes structural elements or petrographic layers that preserve physical and chemical properties from the Paleozoic era.