bituminous coal 
noun [mass noun]
Black coal having a relatively high volatile content and burning with a characteristically bright smoky flame.Only in this region do the reserves of anthracite and bituminous coal exceed the reserves of sub-bituminous coal and lignite....
- The Tertiary coal of northern Thailand is classified according to coal rank as lignite to bituminous coal.
- This is largely due to a combination of factors including our weather, the eradication of smoky bituminous coal in many urban areas during the 1980s and the early 1990s and the introduction of unleaded petrol.