This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A dense, shiny coal that has a high carbon content and little volatile matter and burns with a clean flame. Also called hard coal.

n. A form of carbonized ancient plants; the hardest and cleanest-burning of all the coals; hard coal.

n. A hard, compact variety of mineral coal, of high luster, differing from bituminous coal in containing little or no bitumen, in consequence of which it burns with a nearly non luminous flame. The purer specimens consist almost wholly of carbon. Also called glance coal and blind coal.

n. See Anthracite.

n. A variety of mineral coal (see coal) containing but little hydrogen, and therefore burning almost without flame.

Coal-black: as, the anthracite hawk, Urubitinga anthracina.

n. a hard natural coal that burns slowly and gives intense heat

"Anthracite -- The name anthracite, or hard coal, is applied to those dry coals containing from 3 to 7 per cent volatile matter and which do not swell when burned."

coal   

lignite    coal-burning    bituminous    plumbago    magnetite    bauxite    hot-air    silicium    coke    sunstone