noun
Mineral fuel
Types of coal include: hard coal, soft coal, charcoal, brown coal, pit coal, lignite, tasmanite, subbituminous coal, cannel, anthracite, bituminous, coke, carbocoal, turf, peat, semianthracite, semibituminous coal.
Grades of coal include: broken, lump, chunk, egg, stove, nut, pea, rice, buckwheat, briquette, slack, duff, flaxseed, mustard seed.
An ember
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