black lignite

black lignite

[′blak ′lig‚nīt]
(geology)
A lignite with a fixed carbon content of 35-60% and a total carbon content of 73.6-76.2% that contains between 6300 and 8300 Btu per pound; higher in rank than brown lignite. Also known as lignite A.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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She lay in a stone cist wearing a black lignite necklace and carrying a flint dagger.