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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(hornstein), siliceous rocks (flints, jaspers, menilites) with admixtures of clay material and iron hydroxides; they form concretions and intercalations in carbonate and clay beds. Hornstones often contain carbonates and organic remnants, such as sponges and radiolarians.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.