Cannel coal n. A kind of mineral coal of a black color, sufficiently hard and solid to be cut and polished. It burns readily, with a clear, yellow flame, and on this account has been used as a substitute for candles.
... of a soft black stone that may be cannel coal. It is 3-1/2 inches in length, but is not entire. The shaft is a little more than one-fourth of an inch in diameter, is nearly round, and tapers to a symmetrical point. The surface is highly polished. It was found in the stratum ... — Illustrated Catalogue of a Portion of the Collections Made During the Field Season of 1881 • William H. Holmes
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