coal


coal
n
a brown to black combustible sedimentary rock (in the geological sense) composed principally of consolidated and chemically altered plant remains.
DISCUSSION — Conditions required for formation of coal are believed to include accumulation of plant remains and their partial decomposition under moist conditions, followed by sedimentary burial and subjection to increased pressure and temperature according to the geological history of the seam. Coals exhibit a wide range of properties as a result of differences in the kinds and relative amounts of different plant materials and intermixed mineral matter, the amount of alteration of the plant remains achieved before burial, and especially the degree of physical and chemical alteration after burial. See Classification D388 for classification of coal in accordance with its degree of alteration or rank. The moisture content and the kind, amount, and mode of occurrence of mineral matter also vary greatly.
- banded coal - attrital coal - fusain - vitrain - nonbanded coal - cannel coal - boghead coal - impure coal - bone coal - mineralized coal

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

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  • Coal — Sedimentary Rock Anthracite coal Composition Primary carbon Secondary hydrogen, sulfur …   Wikipedia

  • Coal — (k[=o]l), n. [AS. col; akin to D. kool, OHG. chol, cholo, G. kohle, Icel. kol, pl., Sw. kol, Dan. kul; cf. Skr. jval to burn. Cf. {Kiln}, {Collier}.] 1. A thoroughly charred, and extinguished or still ignited, fragment from wood or other… …   The Collaborative International Dictionary of English

  • coal — [ koul ] noun *** uncount a hard black substance that is dug from the ground and burned as fuel to provide heat: Put some more coal on the fire. coal dust a piece/lump of coal a. uncount used for talking about the industry of digging coal out of… …   Usage of the words and phrases in modern English

  • coal — [kōl] n. [ME & OE col, charcoal, live coal, akin to Ger kohle, ON kol < IE base * g(e)u lo , live coal > Ir gual] 1. a kind of dark brown to black, combustible, sedimentary rock resulting from the partial decomposition of vegetable matter… …   English World dictionary

  • coal — W2S3 [kəul US koul] n [: Old English; Origin: col] 1.) [U] a hard black mineral which is dug out of the ground and burnt to produce heat ▪ Put some coal on the fire. ▪ the coal mining industry ▪ a lump of coal 2.) [C usually plural] a piece of… …   Dictionary of contemporary English

  • coal — O.E. col charcoal, live coal, from P.Gmc. *kula(n) (Cf. O.Fris. kole, M.Du. cole, Du. kool, O.H.G. chol, Ger. Kohle, O.N. kol), from PIE root *g(e)u lo live coal (Cf. Ir. gual coal ). Meaning mineral consisting of fo …   Etymology dictionary

  • Coal — Coal, v. t. [imp. & p. p. {Coaled}; p. pr. & vb. n. {Coaling}.] 1. To burn to charcoal; to char. [R.] [1913 Webster] Charcoal of roots, coaled into great pieces. Bacon. [1913 Webster] 2. To mark or delineate with charcoal. Camden. [1913 Webster]… …   The Collaborative International Dictionary of English

  • Coal — Coal, v. i. To take in coal; as, the steamer coaled at Southampton. [1913 Webster] …   The Collaborative International Dictionary of English

  • coal|er — «KOH luhr», noun. 1. a ship, freight car, or railroad, used for carrying or supplying coal. 2. a worker or merchant who supplies coal …   Useful english dictionary

  • coal|y — «KOH lee», adjective. 1. of or like coal. 2. containing coal …   Useful english dictionary

  • Coal — Saltar a navegación, búsqueda Véase también: Carbón Es un fósil compuesto de combustibles y de otras substancias, por lo general se encuentran en ecosistemas pantanosos, donde los restos de las plantas son cubiertos por agua y lodo, y así, se… …   Wikipedia Español