Mineral coal retaining the texture of the wood from which it was formed, and burning with an empyreumatic odor. It is of more recent origin than the anthracite and bituminous coal of the proper coal series. Called also brown coal, wood coal.

Lignite - A brownish-black coal intermediate between peat and subbituminous in the transformation of plant debris into coal.

A low-grade, brownish-black coal.

Coal, which is brown and incompletely formed, still having the texture of the original wood.