Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A natural vitreous gray or white mineral, Na2CO3·NaHCO3·2H2O, used as a source of sodium compounds.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A saline evaporite, consisting of mixture of sodium carbonate and sodium bicarbonate, Na3HCO3CO3·2H2O.

from the GNU version of the Collaborative International Dictionary of English

  • n. A native double salt, consisting of a combination of neutral and acid sodium carbonate, Na2CO3.2HNaCO3.2H2O, occurring as a white crystalline fibrous deposit from certain soda brine springs and lakes; -- called also urao, and by the ancients nitrum.

from The Century Dictionary and Cyclopedia

  • n. The native soda of Egypt, a hydrous carbonate of sodium, Na2CO3.HNaCO3 + 2H2O.

Etymologies

Swedish, probably from Arabic dialectal ṭrōn, variant of Arabic naṭrūn, natron; see natron.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From the Swedish trona or from the Spanish trona, both derived from the Arabic اطرون (atrūn), which derives from the Arabic نطرون (natrūn); from the Ancient Greek νίτρον (nitron), from the Ancient Egyptian ntry. (Wiktionary)

Examples

  • In the beginning of winter the trona is the thickest and best, but in the spring it disappears entirely.

    Documenting the American South: The Southern Experience in 19-th Century America

  • And so we control emissions of sulfur dioxide in other ways, principally by using the trona, which is chemically very similar to sodium bicarbonate.

    SeekingAlpha.com: Home Page

  • Trona is a desperate little town one valley over from Death Valley - a lifeless, dust-blown sulfate mining town, named for trisodium hydrogendicarbonate dihydrate, or trona, which is what they pull out of the ground around there.

    mental_floss Blog

  • The Wyoming Basin also has extensive coal deposits along with areas of trona, bentonite, clay, and uranium mining.

    Ecoregions of Wyoming (EPA)

  • Oil and gas exploration, along with mining (strip mining for coal and hard-rock mining for trona and other industrial minerals), have the potential to cause considerable disturbance, wildlife displacement, and environmental pollution. 6,000 to 11,000 new oil and gas wells could be sunk in southwestern Wyoming in the next 20 years.

    Wyoming Basin shrub steppe

  • This deposit consists of thick, extensive beds of trona and thin trona beds inter-bedded with salt (halite).

    Soda ash or Trona

  • The largest trona deposit in the world is in the Green River Basin of Wyoming.

    Soda ash or Trona

  • It is made both by the processing of the minerals trona (Na3H (CO3) 2. 2H2O) and nahcolite (NaHCO3), and by processing sodium carbonate-rich waters (called brines).

    Soda ash or Trona

  • This is known as the Solvay process, and was the main source of soda ash until the Wyoming trona deposits were discovered.

    Soda ash or Trona

  • The Wyoming Basin also has extensive coal deposits along with areas of trona, bentonite, clay, and uranium mining. 18a.

    Ecoregions of Colorado (EPA)

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