Anthracite 3 : Hard coal, found deep in the earth. It burns very hot, with little flame. It usually has a heating value of 12,00015,000 British thermal units (Btus) per pound
United States Department of Agriculture USDA, Glossary of Terms, Washington, DC, USA 2014. http://www.usda.gov/energy/matrix/FindTerms, (Oil - Amer) {780}