(of coal) dark brown to black and intermediate in rank between lignite and bituminous
Examples of 'subbituminous' in a sentence
subbituminous
Besides, it was used in the hydroconversion of a colombian subbituminous coal.
Juliana Sánchez-Castañeda, Andrés Moreno-Lopera, Wilson A. Ruiz-Machado 2016, 'The use of an industrial mineral waste as catalyst in the hydroconversion of dibenzyletherand a colombian subbituminous coal', Tecno Lógicashttp://itmojs.itm.edu.co/index.php/tecnologicas/article/view/861/796. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)