Seminole Group - Anthracite
Anthracite coal is the highest-ranking form of mineral coal.
The highest-ranking form of mineral coal is anthracite coal. It is a hard compact variety of coal that has a high luster. It has the highest carbon content, between 92 and 98 percent, and contains the fewest impurities.
Anthracite coal is the highest metamorphic rank. It is the production of metamorphism and is associated with metamorphic rock. It may be considered a transition between ordinary coal and graphite.
Anthracite coal is found most abundantly in flanks of mountain ranges or other areas subject to considerable earth movements. Anthracite coal burns cleanly and produces little soot. Today it is used principally as a domestic fuel in hand fired ovens and automatic stoker furnaces.