Lignite

n. soft dark brown coal

Lignite, often referred to as brown coal, is the lowest rank of coal and used almost exclusively as fuel for steam-electric power generation. It is brownish-black and has a high inherent moisture content, sometimes as high as 66 percent, and very high ash content compared with bituminous coal. It is also a heterogeneous mixture of compounds for which no single structural formula will suffice.
See more at Wikipedia.org...

Noun
1. intermediate between peat and bituminous coal
(synonym) brown coal, wood coal
(hypernym) coal
(hyponym) jet

n. lignite, soft dark brown coal

n. lignite, soft dark brown coal