Cannel Coal

 Cannel coals are made up entirely of attritus, often rich in spores. Spores are the reproductive organs of the lower plants that do not produce seeds. Cannel coals are often rich in volatile matter and burn with a long yellow flame. They used to be called ''candle" coals because of the appearance of the flame and because many of them can be lighted with a match or a piece of burning paper. It usually occurs in small lenses or deposits in beds of other coals and must be separated from the other coal during mining. In the original coal swamps, the spore and seed case of plants and finely divided particles of woody material floated upon the open water until they became waterlogged, sank to the bottom and finally changed in to cannel coal.