natron

A mineral of hydrous sodium carbonate, Na₂CO₃·10H₂O, often found crystallized with other salts. It can act as a dessicant and was used in mummification.

Native carbonate of sodium, or mineral alkali (Na₂CO₃.10H₂O).

Native sodium carbonate.

A crystalline mixture of hydrous sodium carbonate and sodium bicarbonate, with the chemical formula Na2CO3·10H2O.