Ulexite


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ulexite

[′ü·lek‚sīt]
(mineralogy)
NaCaB5O9·8H2O A white mineral that crystallizes in the triclinic system and forms rounded reniform masses of extremely fine acicular crystals. Also known as cotton ball.
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 It might be outdated or ideologically biased.

Ulexite

 

(named after the German chemist G. L. Ulex [1811-83]), a mineral of the subclass of hydrous borates, NaCa[B509]-8H20. Ulexite crystallizes in the monoclinic system. It forms white compact masses of fine fibers or radiating aggre gates. It has a hardness of 1 on Mohs’ scale and a density of 1,650 kg/m3. Ulexite occurs as a supergene mineral in lake deposits and is a substitution product in argillaceous gypsum-bearing ores in salt domes. It is an ore of boron. Ulexite deposits are found at Inder (USSR) and in Nevada (USA).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Sugozu (2009) produced the brake pad specimens using ulexite, colemanite, boric acid and borax pentahydrate which are boron derivatives, and then examined the properties of the produced brake pads including the friction, wear, and resistance.
Also in a study used Taguchi method [17], the optimization of the dissolution of ulexite in SO2-saturated water has been investigated.
Kunkul, "Dissolution kinetics of ulexite in perchloric acid solutions," International Journal of Mineral Processing, vol.
Three other commercially available B sources viz., borax, ulexite and colemanite were also co-granulated with MAP.
Colak, Leaching kinetics of ulexite in borax pentahydrate solutions saturated with carbon dioxide, Journal of Industrial and Engineering Chemistry, 16(2010), No.5.
(2005) como eficaz para diferenciar la masa de ulexite de otros materiales que no lo son.
investigated ulexite in borax pentahydrate solutions.
The crushed ores are colemanite (Ca2B6O .5H O), ulexite (Na O.2CaO.5B2O3.16H2O), datolite (2CaO.B2O3.2SiO2.H2O), hydroboracite (CaO.MgO.3B2O3.6H2O) and ascharite (2MgO.B2O3.H2O).
Within commercial products and the most important minerals that contain boron are the borax pentahydrate, sodium perborate, boric acid, colemanite and ulexite. Different applications for these compounds exist, between which can be mentioned: fiber glass, enamels, fire delayers, fertilizers and agricultural herbicides (IPCS, 1998).
More than 230 different types of boron minerals are known in nature, but the number having commercial importance is limited to the following: tincal, colemanite, kernite, ulexite, pandermite, boracite, szaibelyite and hydroboracite.