Formula: Na2CO3.10H2O Hydrated normal carbonate
Specific gravity: 1.478
Hardness: 1
Streak: White
Colour: Colourless, white, grey, yellow
Solubility: Soluble in water forming alkali solution, effervesces in acid.

Sedimentary environments

On slight heating natron decomposes to thermonatrite and H2O. It forms from water solution below 32oC but when other salts are present the temperature limit may be lower. It occurs in soda lakes. In the Eastern Gobi desert it is associated with thermonatrite, trona, gaylussite and calcite (Dana).

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