from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A white mineral, NaCaB5O9·8H2O, that forms rounded masses of very fine needle-shaped crystals.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A white mineral with triclinic crystals, NaCaB5O9·8H2O.

from the GNU version of the Collaborative International Dictionary of English

  • n. A mineral occurring in white rounded crystalline masses. It is a hydrous borate of lime and soda.

from The Century Dictionary and Cyclopedia

  • n. A hydrous borate of calcium and sodium, occurring in loose rounded masses with fibrous structure and white color. Also called boronatrocalcite, natroborocalcite.


After Georg Ludwig Ulex (1811-1883), German chemist.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Named after the German chemist George Ludwig Ulex (1811-1883). (Wiktionary)


  • A ulexite student project led me to the work of Daniel Koon, an associate professor of physics at St. Lawrence University, New York.

    Fibre optics - the bear facts

  • This reminds me somewhat of 'TV rock' (a. k.a television stone), a form of the borate ulexite.

    Fibre optics - the bear facts

  • The May 1998 Contraption also features ulexite, along with interesting UV-sensitive beads and nail varnish.

    Fibre optics - the bear facts

  • The principal boron minerals are borax or "tincal" (hydrated sodium borate), colemanite (hydrated calcium borate), ulexite (hydrated calcium-sodium borate), and boracite (magnesium chloro-borate).

    The Economic Aspect of Geology

  • The salts contained in these deposits are mainly borax, ulexite, and colemanite.

    The Economic Aspect of Geology

  • The soda-lime borate ulexite occurs as irregular balls, rough on the outside, but found on breaking to consist entirely of white, silky, radiating annular crystals.

    Documenting the American South: The Southern Experience in 19-th Century America

  • It can be found in the ores ulexite and borax (yes, that borax).

    Green Options

  • The detection of cotton ball ulexite by Frances Marion Smith was what initiated the first major production of borax.

    CreationWiki - Recent changes [en]

  • Mary Shoemaker, left, a Penn State chemistry professor, describes ulexite and fiber optic cable properties to Minerals Junior Education Day youth participants Maya, Lindsay and Isabella (left to right) during the event, held on Saturday, March 28, in the Earth and Engineering Sciences Building.

    Penn State Live

  • The major ores of boron are a small number of borate (boron oxide) minerals, including ulexite (NaCaB5O9. 8H2O), borax (Na2B4O5 (OH) 4. 8H2O), colemanite (Ca2B6O11. 5H2O) and kernite (Na2B4O6 (OH) 2. 3H2O).



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