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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.



(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).

References in periodicals archive ?
For the fertilisers co-granulated with colemanite, ulexite and borax, which have a basic reaction, the solution pH was between 5.
Colak, Leaching kinetics of ulexite in borax pentahydrate solutions saturated with carbon dioxide, Journal of Industrial and Engineering Chemistry, 16(2010), No.
2005) como eficaz para diferenciar la masa de ulexite de otros materiales que no lo son.
Kunkul, Dissolution kinetics of ulexite in acetic acid solutions, Chemical Engineering Research and Design, 86, 1101-1016 (2008).
Eti Mine processes and markets the boron minerals commonly found in Turkey, namely tincal, colemanite and ulexite at the following facilities; Emet-Kutahya, Kirka-Eskisehir, Bandirma-Balikesir, Bigadic-Balikesir and Kestelek-Bursa.
Neither calcium borate nor Ulexite is yet registered as a wood preservative with the U.
Three facies, designated Barren (calcareous nodules), Colemanite (calcium borate) and Ulexite (calcium and sodium borate) overlie the sodium borate facies where most of the useable ore is to be found.
The important boron minerals of Turkey are tincal, colemanite and ulexite.
Groups of A and B glazes were prepared with colemanite, ulexite and raw and calcined saggar ash in conformity with the binary system.
Boron production is carried out at four mines and four associated processing plants which produce three different borate minerals: colemanite, ulexite and tincal.
Yartasi, The Dissolution Kinetics of Ulexite in Sulphuric Acid Solutions, Chem Biochem.
From 1900 until 1941, the Salar de Empexa was the most important ulexite producer in Bolivia, with a 60-cm-thick bed of ulexite, now worked out, at Boratera Laqueca, and a 30-cm to 40-cm bed at Boratera Isma, likewise mined out.