Vitrain definition

vĭtrān
A brilliant black band in bituminous coal, characterized by cubic cleavage, a conchoidal fracture, and a vitreous luster.
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A type of black, glassy, cubic bituminous coal.
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Origin of vitrain

  • Latin vitreus made of glass, glassy vitreous (fus)ain

    From American Heritage Dictionary of the English Language, 5th Edition