Noun
cannel (countable and uncountable, plural cannels)
A bituminous coal that burns brightly with much smoke.
Synonym: cannel coal
Geologists can classify oil shales on the basis of their composition as carbonate -rich shales, siliceous shales, or cannel shales. Source: Internet
Young eventually succeeded, by distilling cannel coal at a low heat, in creating a fluid resembling petroleum, which when treated in the same way as the seep oil gave similar products. Source: Internet