Anthracite coal

Anthracite is a hard, compact variety of mineral coal, of high luster, differing from bituminous coal in containing little or no bitumen, in consequence of which it burns with a nearly non luminous flame. The purer specimens consist almost wholly of carbon.

It was first experimentally burned as a fuel on February 11, 1808.

Anthacite delivers high energy per weight and burns cleanly with little soot, making it a sought after variety of coal and hence of higher price.