Semi-anthracite
Semi-anthracite is a distinct rank of coal that occupies a middle ground between high-grade anthracite and the more common bituminous coals. It combines many of the advantageous physical and chemical…
Anthracite
Anthracite is the highest rank of coal, prized for its high-grade energy content and distinctive physical properties. This dense, hard variety of coal has played an important role in industry,…
