Why Anthracite is called the best quality of Coal?

Why Anthracite is called the best quality of Coal?

ANTHRACITE COAL
Anthracite, the highest rank of coal is a harder, glossy, black coal used primarily for residential and commercial space heating. It contains from 80% of carbon. Anthracite is the best quality of coal with least ash content. Anthracite is a hard, compact variety of mineral coal that has a high luster. It has the highest carbon count and contains the fewest impurities of all coals, and has the highest calorific content as compared to other types of coals such as bituminous coal and lignite.

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