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Related to vitrain: durain
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.]
(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]