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A brilliant black coal lithotype with vitreous luster and cubical cleavage. Also known as pure coal.



one of the components of coal. Its chemical properties are similar to those of the humus substances in peat. The vitrain in coal contains more carbon and has less H, O, and volatile substances in proportion to the degree of transition from the brown coals to anthracite. Vitrain exists in a form of lenses or layers of various thicknesses and is the least cinderlike component of coal.

References in periodicals archive ?
Since the brittleness and the Hardgrove Grindability Index (HGI) of vitrain are lower than those of fusain [39], the vitrinite gathers in large coal particles and can be easily broken into pieces, while the inertinite gathers in small coal particles and can be easily broken into powder.
Wei, "Difference in pore structures and adsorptivity between raw and two-step-solvent -extracted vitrains," Natural Gas Geoscience, vol.