noun
A type of coal with a high volatile content, used in industry and power generation. Technical term; in everyday contexts, simply 石炭 (coal) is more common.
瀝青炭は発電所でよく使われる。
Bituminous coal is often used in power plants.
Compound of 瀝青 (bitumen, pitch) and 炭 (coal). The kanji 瀝 means 'drip' or 'trickle', referring to the pitch-like substance, while 青 (blue/green) is used here in the sense of 'pitch' or 'tar'. The variant 歴青炭 replaces 瀝 with the simpler 歴, likely for ease of writing.