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Lignite and cannel are usually dull and earthy, and of an irregular fracture, the latter being much tougher than the black coal.
Some lignites are, however, quite as brilliant as anthracite; cannel and jet may be turned in the lathe, and are susceptible of taking a brilliant polish.
This excess is greatest in what is Gas known as cannel coal, the Lancashire kennel or candle coal, so named from the bright light it gives out when burning.
It is a species of cannel coal, somewhat similar to the Boghead mineral of Scotland, but yielding a much larger percentage of volatile hydro-carbon than the Scottish mineral.
The word "kennel," a gutter, a drain in a street or road, is a corruption of the Middle English canel, cannel, in modern English "channel," from Latin canalis, canal.