trona

[troh-nuh]
noun
a monoclinic mineral, grayish or yellowish hydrous sodium carbonate and bicarbonate, Na 2 CO 3 ⋅NaHCO 3 ⋅2H 2 , occurring in dried or partly evaporated lake basins.

Origin:
1790–1800; < Spanish < dialectal Arabic ṭrōn, aphetic variant of naṭrūn natron

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trona (ˈtrəʊnə)
 
n
a greyish mineral that consists of hydrated sodium carbonate and occurs in salt deposits. Formula: Na2CO3NaHCO3.2H2O
 
[C18: from Swedish, probably from Arabic natrūnnatron]

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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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Example sentences
Trona was mined using conventional room and pillar mining.
The mineral trona is a naturally occurring mixture of sodium carbonate, sodium bicarbonate, and water.
Trona is a mineral found in deposits left behind by the evaporation of ancient water bodies.
Trona provided a cost-effective source of carbonates, which helped reduce scaling in the processing equipment.
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