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trona

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tro⋅na

  [troh-nuh]
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–noun
a monoclinic mineral, grayish or yellowish hydrous sodium carbonate and bicarbonate, Na2CO3·NaHCO3·2H2, occurring in dried or partly evaporated lake basins.
Origin:
1790–1800; < Sp < dial. Ar ṭrōn, aph. var. of naṭrūn natron
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tro·na   (trō'nə)   
n.  A natural vitreous gray or white mineral, Na2CO3·NaHCO3·2H2O, used as a source of sodium compounds.

[Swedish, probably from Arabic dialectal ṭrōn, variant of Arabic naṭrūn, natron; see natron.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia

trona

an evaporite mineral, hydrated sodium bicarbonate [Na3H(CO3)22H2O], occasionally encountered as a saline lake deposit or evaporation product and as an efflorescence on arid soil. Usually associated with natron, thermonatrite, halite, and gypsum, it occurs near Memphis, in the Lower Nile Valley; widely in the soda lakes of Africa, Armenia, Iran, and the western United States; and in the alkali deserts of Mongolia and Tibet. For detailed physical properties, see carbonate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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