vitrain

Definitions

A constituent of banded bituminous coal consisting of a horizontal glossy band of friable material.

countable, uncountable

Equivalents

Examples

“The caking behaviour of vitrain and clarain could be improved after the coal has been picked out.”

“In order⟳ to measure⟳ relatively accurately the activation energy of coal, and to exclude⟳ the disturbance from coal samples, the hand-picked banded vitrains in bright coal are adopted as experimental samples (Table 1).”

“Thus, it may be concluded that a lower viscosity of plastic vitrain grains facilitates pores to grow⟳ and coalesce and grains to stick⟳ to one another to create⟳ intergrain pores.”

CEFR level