channel coal
Noun
Meaning
channel coal (uncountable)
(geology) A kind of coal, historically found near the surface, which split like shale rock and burned with medium smoke, a yellow flame and a sulfur smell.
Noun
channel coal (uncountable)
(geology) A kind of coal, historically found near the surface, which split like shale rock and burned with medium smoke, a yellow flame and a sulfur smell.