Anthracite (stone coal) is a kind of coal distinguished by its great hardness, its high proportion of carbon, and the great heat given out in burning. The highest rank of coal. By definition, a coal with a fixed carbon content of over 91% on a dry ash-free basis. Anthracite coals have a bright luster, break with a conchoidal fracture, a semi-metallic luster and are difficult to ignite. Frequently referred to by the layman as “hard coal”.
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