Natron, or TRONA, an impure sesquicarbonate of soda, which always contains sulphate of soda and chloride of sodium. It is obtained from the margins of lakes in Egypt, Siberia, Tibet, &c., and from the borders of the Black and Caspian Seas.
Natron,
Chambers's Encyclopaedia, Volume 7: Maltebrun to Pearson, p. 407
Source scan(s): p. 0416