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AlO(OH) Gray, brown, or red orthorhombic mineral that is a major constituent of some bauxites.
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 It might be outdated or ideologically biased.



(named after the 20th-century German mineralogist J. Böhm), a mineral with the composition AlOOH. It crystallizes into a rhombic system, forming fine, plastic crystalline particles. It is colorless and transparent. Its hardness on the mineralogical scale is 3.5, and its density is 3,020–3,060 kg/m3 Rarely found in pure form, boehmite usually occurs with other aluminum hydroxides in bauxite compositions.

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