vitrain

n
shiny black bands, thicker than 0.5 mm, of subbituminous and higher rank banded coal.
DISCUSSION — Vitrain, attributed to the coalification of relatively large fragments of wood and bark, may range up to about 30 mm (approximately 1 in.) thick in eastern North American coals, but may be much thicker in the younger western deposits. Vitrain is commonly traversed by many fine cracks oriented normal to the banding. In lignite, the remains of woody material lack the shiny luster of vitrain in the higher rank coals and may instead be called previtrain. It is differentiated from attrital bands of lignite by its smoother texture, often showing the grain of wood. Previtrain may be several inches thick.

ASTM D121-09a Standard Terminology of Coal and Coke. 2014.

Look at other dictionaries:

  • vitrain — ● vitrain nom masculin ou vitrinite nom féminin (de vitre) Composant des charbons, noir et brillant, correspondant à un gel de matière organique. ⇒VITRAIN, subst. masc. GÉOL. ,,Charbon brillant, constitué d une masse fondamentale distribuée en… …   Encyclopédie Universelle

  • Vitrain — is a type of coal. Its combustion leads to ash containing high levels of Germanium tetrachloride …   Wikipedia

  • vitrain — [vi′trān΄] n. [< L vitrum, glass + ain, as in FUSAIN] a type of black, glassy, cubic bituminous coal …   English World dictionary

  • vitrain — vitrenas statusas T sritis chemija apibrėžtis Iškasamųjų anglių blizgioji petrografinė atmaina. atitikmenys: angl. vitrain rus. витрен …   Chemijos terminų aiškinamasis žodynas

  • vitrain — /vi trayn/, n. the material of which the friable, vitreous layers in banded bituminous coal are composed. Cf. clarain, durain. [1915 20; < L vitr(um) glass + ain, as in FUSAIN] * * * …   Universalium

  • vitrain — vit·rain …   English syllables

  • vitrain — ˈvi.ˌtrān noun ( s) Etymology: vitr + ain (as in fusain) : a constituent of banded bituminous coal that has a vitreous or glossy fracture compare clarain, durain, fusain …   Useful english dictionary

  • coal — coalless, adj. /kohl/, n. 1. a black or dark brown combustible mineral substance consisting of carbonized vegetable matter, used as a fuel. Cf. anthracite, bituminous coal, lignite. 2. a piece of glowing, charred, or burned wood or other… …   Universalium

  • CHARBONS — Toute une série de roches sédimentaires, tourbe, lignite et houille, entre autres, résultent de la transformation d’anciens végétaux terrestres. Les débris de plantes mortes sont normalement détruits à l’air, mais noircissent sous l’eau par… …   Encyclopédie Universelle

  • attrital coal — n the ground mass or matrix of banded coal in which vitrain and, commonly, fusain layers as well, are embedded or enclosed. DISCUSSION Layers in banded coal, often referred to as bands, are commonly 1 to 30 mm thick. Attrital coal in banded coal… …   Coke&Coal Terminology

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