Anthracite
WEBAnthracite (Greek Ανθρακίτης, literally "a form of coal", from Anthrax [Άνθραξ], coal) is a hard, compact variety of mineral coal that has a high has the highest carbon count and contains the fewest impurities of all coals, despite its lower calorific content.. Anthracite coal is the highest of the metamorphic rank, in which the carbon content is .