Ulexite
noun
1.
a mineral, hydrous sodium and calcium borate, NaCaB 5 O 9 ⋅8H 2 O, occurring in arid regions in the form of white acicular crystals: a major source of borax.
ulexite
(y’lĭk-sīt’, y-lěk’-)
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.
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