vitrain
nounEtymology From Latin vitreus (“vitreous”) + -ain in fusain; compare French -ain (“-ane”). Coined by British birth control campaigner and paleontologist Marie Stopes in 1918.
1
A constituent of banded bituminous coal consisting of a horizontal glossy band of friable material.
- The caking behaviour of vitrain and clarain could be improved after the coal has been picked out.1996, T.S. Golosinski, Guo Yuguang, Mining Science and Technology 1996, →ISBN, page 396:
- 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).1997, Yang Qi, Geology of Fossil Fuels: Coal, →ISBN, page 149:
1 more example
- 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.2012, C.E. Snape, Composition, Geochemistry and Conversion of Oil Shales, →ISBN, page 491:
- Coordinate terms
- fusain