ulexite

ulexite
/yooh lek"suyt/, n.
a mineral, hydrous sodium and calcium borate, NaCaB5O9·8H2O, occurring in arid regions in the form of white acicular crystals: a major source of borax.
[1865-70; named after George L. Ulex, German chemist; see -ITE1]

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      borate mineral, NaCaB5O6(ΟH)6·5H2O, that consists of hydrated sodium and calcium borate. Individual crystals are colourless and have a vitreous lustre, whereas the more common nodular, rounded, or lenslike crystal aggregates (often resembling cotton balls) are white and have a silky or satiny lustre. It is sometimes called “television rock” or “TV rock” for its fibre-optical properties.

      Ulexite is found in arid regions, where it may be derived from boron leached from sediments and pyroclastic rocks by circulating waters. Typical occurrences are in saline playas (dry lakes) and marshes, as in Esmeralda county, Nevada; in Death Valley and the Kramer district, California; in the nitrate region of Chile, where it is widespread; and in Canada's Maritime provinces. For detailed physical properties, see borate mineral (table).

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Universalium. 2010.

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Look at other dictionaries:

  • Uléxite — Catégorie VI : borates[1] Général …   Wikipédia en Français

  • Ulexite — (NaCaB5O9·8H2O) (hydrated sodium calcium borate hydroxide) is a mineral occurring in silky white rounded crystalline masses or in parallel fibers. It was named after the German chemist Georg Ludwig Ulex (1811−1883) who first discovered it.Ulexite …   Wikipedia

  • ULEXITE — Borate hydraté dont la formule chimique peut s’écrire NaCaB598H2O, l’ulexite est parfois dénommée, à tort, boronatrocalcite, car ce terme peut aussi s’appliquer à la probertite de composition chimique qualitative analogue. L’ulexite contient… …   Encyclopédie Universelle

  • Ulexite — L’ulexite (NaCaB5O9·8H2O) est un minerai de bore et contient 43% de borates …   Wikipédia en Français

  • Ulexite — U lex*ite, n. [After a German chemist.] (Min.) A mineral occurring in white rounded crystalline masses. It is a hydrous borate of lime and soda. [1913 Webster] …   The Collaborative International Dictionary of English

  • ulexite — uleksitas statusas T sritis chemija apibrėžtis Mineralas. formulė NaCa[B₅O₆(OH)]·5H₂O atitikmenys: angl. boronatrocalcite; natronborocalcite; ulexite rus. боронатрокальцит; улексит ryšiai: sinonimas – natrioborokalcitas sinonimas –… …   Chemijos terminų aiškinamasis žodynas

  • ulexite — noun Etymology: George L. Ulex died 1883 German chemist Date: 1867 a soft mineral consisting of a hydrous borate of sodium and calcium and usually occurring in loose masses of white fibers …   New Collegiate Dictionary

  • ulexite — noun A white mineral with triclinic crystals, NaCaB<sub>5</sub>O<sub>9</sub></sub>·8H<sub>2</sub>O …   Wiktionary

  • ulexite — ulex·ite …   English syllables

  • ulexite — u•lex•ite [[t]yuˈlɛk saɪt[/t]] n. mir a whitish mineral, hydrous sodium calcium borate, NaCaB5O9∙8H2O, occurring in arid regions as rounded masses of radiating crystal needles • Etymology: 1865–70; after George L. Ulex, German chemist …   From formal English to slang

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