1) Carbonate mineral 
Thermonatrite is a naturally occurring evaporite mineral form of sodium carbonate, Na2CO3·H2O. It was first described in 1845. Its name is from the Greek θερμός, `thermos`, heat, plus natron, because it may be a dehydration product of natron. Typical occurrence is in dry saline lake beds and as soil encrustations. It has been reported fro.....
a carbonate mineral, hydrated sodium carbonate (Na2CO3H2O), found near saline lakes as an evaporation product or on arid soil as an efflorescence. ...
Sodium carbonate