ulexite

[yoo-lek-sahyt]

noun

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.

Origin of ulexite

1865–70; named after George L. Ulex, German chemist; see -ite¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

The salts contained in these deposits are mainly borax, ulexite, and colemanite.
The Economic Aspect of Geology
C. K. Leith

ulexite in Science

[yōō′lĭk-sīt′, yōō-lĕk′-]

A white triclinic mineral that forms rounded, reniform (kidney-shaped) masses of very fine needle-shaped crystals. Ulexite has the unusual optical property of projecting an image of an object placed against a transverse section of it to the opposite surface. It is usually associated with borax deposits and is found in arid environments. Chemical formula: NaCaB5O9·8H2O.