a. A type of banded coal defined microscopically as consisting of more than 5% of anthraxylon and less than 20% of opaque matter; banded coal in which translucent matter predominates. Bright coal corresponds to the microlithotypes vitrite and clarite and in part to duroclarite and vitrinerite. CF: dull coal
b. The constituent of banded coal that is of a jet black, pitchy appearance, more compact than dull coal, and breaking with a conchoidal fracture when viewed macroscopically, and that in thin section always shows preserved cell structure of woody plant tissue, either of stem, branch, or root. Same as anthraxylon. AGI
c. A coal composed of anthraxylon and attritus, in which the translucent cell-wall degradation matter or translucent humic matter predominates. AGI
d. A type of banded coal containing from 100% to 81% pure bright ingredients (vitrain, clarain, and fusain), the remainder consisting of clarodurain and durain. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms












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