Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
, volcanic glass formed by the solidification of lava that is permeated with gas bubbles. Usually found at the surface of a lava flow, it is colorless or light gray and has the general appearance of a rock froth.
..... Click the link for more information. .
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
Vesicular, cindery, dark lava formed by the escape and expansion of gases in basaltic or andesitic magma; generally denser and darker than pumice.
Refuse after melting metals or reducing ore.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
1. A dark, cellular volcanic rock.
2. Blast-furnace slag or scum.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
1. a rough cindery crust on top of solidified lava flows containing numerous vesicles
2. refuse obtained from smelted ore; slag
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005