[Answer] anthracite:

Answer: a coal that burns with very little smoke or flame; hard coal. It consists
almost entirely of carbon.
Word Origin late 16th century (denoting a gem described by Pliny and said to resemble coals supposedly hydrophane (a type of opal)): from Greek anthrakitēs from anthrax anthrak- ‘coal’.
Scrabble Points: 15
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Anthracite also known as hard coal is a hard compact variety of coal that has a submetallic luster.It has the highest carbon content the fewest impurities and the highest energy density of all types of coal and is the highest ranking of coals.
What Is Anthracite? Anthracite is considered a type of hard coal. Among the various types of coal in existence this compound is touted as the most highly metamorphosed form of coal.
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Definition of anthracite : a hard natural coal of high luster differing from bituminous coal in containing little volatile matter and in burning very cleanly — called also hard coal Other Words from anthracite Example Sentences Learn More About anthracite
Anthracite is the least plentiful form of coal. In the United States it is found mostly in northeastern Pennsylvania and makes up less than 2 percent of all coal reserves in the country. Smaller amounts of anthracite occur in South Africa Australia eastern Ukraine western Canada China and other countries.
Anthracite is considered the cleanest burning coal available. It produces more heat and less smoke than other coals and is widely used in hand-fired furnaces. Some residential home …

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