[thuh-nahr-dahyt, tuh-]
a mineral, sodium sulfate, Na 2 SO 4 , occurring in white crystals and masses, especially in salt lakes and arid regions.

1835–45; named after L. J. Thénard (1777–1857), French chemist; see -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thenardite (θɪˈnɑːdaɪt, tɪ-)
a whitish vitreous mineral that consists of anhydrous sodium sulphate and occurs in saline residues. Formula: Na2SO4
[C19: named after Baron L. J. Thénard (1777--1857), French chemist; see -ite1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica


any of a type of sodium sulfate mineral (Na2SO4) that has been deposited as an evaporation product near salt lakes and playas, as in the arid regions of northern Africa, Siberia, Canada, and the western United States. It is widespread as an efflorescence on arid soil and as a crust in volcanic fumarole deposits. For detailed physical properties, see sulfate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Minerals currently solution mined include trona, borax, and thenardite.
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