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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A saline evaporite, consisting of sodium carbonate, with the chemical formula Na2CO3·H2O.

from The Century Dictionary and Cyclopedia

  • n. Hydrous sodium carbonate (Na2CO3 + H2O), occurring chiefly as an effiorescence in connection with saline lakes.


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  • Sodium carbonate has three known forms of hydrates: sodium carbonate decahydrate (natron), sodium carbonate heptahydrate (not known in mineral form) and sodium carbonate monohydrate (mineral thermonatrite).

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