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brown coal

noun
1.
a low-quality coal intermediate in grade between peat and lignite
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for brown coal

broad and variable group of low-rank coals characterized by their brownish coloration and high (greater than 50 percent) moisture content. These coals typically include lignite and some subbituminous coals. In Great Britain and other countries, the term brown coal is used to describe those low-rank coals (lignite and subbituminous coal) that generally have a brown colour. In Germany lignite, subbituminous coal, and some high-volatile bituminous coals are classified as brown coals (Braunkohle). In the United States and Canada, the term brown coal is not used.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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