buckwheat coal

buckwheat coal

[′bək‚wēt ‚kōl]
(geology)
An anthracite coal that passes through ⁹⁄₁₆-inch (14-millimeter) holes and over ⁵⁄₁₆-inch (8-millimeter) holes in a screen.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.