the material of which the friable, vitreous layers in banded bituminous coal are composed.
Compare clarain, durain.

1915–20; < Latin vitr(um) glass + -ain, as in fusain Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vitrain (ˈvɪtreɪn)
a type of coal occurring as horizontal glassy bands of a nonsoiling friable material
[C20: from Latin vitrum glass + -ain, as in fusain]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The banded ingredients sampled were vitrain, clarain and fusain.
Where possible, the samples were selected from litho-types rich in vitrain.
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