| 释义 |
vitrain
vit·rain V5138350 (vĭt′rān)n. A brilliant black band in bituminous coal, characterized by cubic cleavage, a conchoidal fracture, and a vitreous luster.
[Latin vitreus, made of glass, glassy; see vitreous + (fus)ain.]vitrain (ˈvɪtreɪn) n (Geological Science) a type of coal occurring as horizontal glassy bands of a nonsoiling friable material[C20: from Latin vitrum glass + -ain, as in fusain]Vitrain
vitrain[′vi‚trān] (geology) A brilliant black coal lithotype with vitreous luster and cubical cleavage. Also known as pure coal. Vitrain 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. |