- attrital
- at·tri·tal
English syllables. 2014.
attrital
Look at other dictionaries:
attrital — ə.ˈtrīd.əl, a.ˈ , ītə adjective Etymology: Latin attritus + English al : of or relating to matter that has been worn by attrition attrital coal … Useful english dictionary
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
Petrologic components in coal and their groupings — ▪ Table Petrologic components (macerals) in coal and their groupings maceral grouping in Europe macerals maceral grouping in the United States name in Europe* name in the United States** vitrinite telinite megascopic anthraxylon attrital… … Universalium
banded coal — n coal that is visibly heterogeneous in composition, being composed of layers of vitrain and attrital coal, and, commonly, fusain … Coke&Coal Terminology
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… … Coke&Coal Terminology
lithotype — n 1) (1) Rock form defined on the basis of certain selected physical characteristics. (2) One of the four macroscopically recognized constituents of banded coal: vitrain, clarain, durain and fusain. D4596 2) any of the constituents of banded coal … Coke&Coal Terminology
nonbanded coal — n consistently fine granular coal essentially devoid of megascopic layers. DISCUSSION Nonbanded coal may be interbedded with common banded coal, or form a discrete layer at the top or at the bottom of the seam, or may compose the entire seam. It… … Coke&Coal Terminology
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 … Coke&Coal Terminology
