Min. [a. Ger. thermonatrit (Haidinger, 1845), ‘because it results from the drying out of natron’ (Chester), f. THERMO- + NATRON: see -ITE1.] Hydrous carbonate of soda, found in various saline lakes, about some mines and volcanoes, and as an efflorescence in many dry regions.
1859. Page, Handbk. Geol. Terms, s.v., According to Haidinger, a saturated solution of soda at a temperature of 77° to 99° Fahr., and cooling slowly, forms crystals of thermonatrite.
1863–72. Watts, Dict. Chem., I. 795. Na2CO3+aq. formed from the deca-hydrate by efflorescence, is found native as thermonatrite, in the same localities as natron.
