Which of the following is considered the best quality of coal?

Anthracite is the best quality coal, with the highest carbon content and heat value.

Peat is the lowest grade, barely converted from plant matter.

Lignite, or brown coal, is a low-grade fuel with high moisture.

Bituminous is a good middle grade but ranks below anthracite.

Anthracite burns cleanly with little smoke because of its high fixed carbon.

Coal grade rises through the series from peat to anthracite.