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2017 Word of the Year

ulexite

[yoo-lek-sahyt] /yuˈlɛk saɪt/
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.
Origin of ulexite
1865-1870
1865-70; named after George L. Ulex, German chemist; see -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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ulexite in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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