semibituminous coal

semibituminous coal

[¦sem·i·bə′tü·mə·nəs ′kōl]
(geology)
Coal that is harder and more brittle than bituminous coal, has a high fuel ratio, contains 10-20% volatile matter, and burns without smoke; ranks between bituminous and semianthracite coals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.