Thermonatrite is a rare mineral that belongs to the carbonate group. It is primarily composed of sodium carbonate decahydrate, which makes it a hydrated mineral. Though it is not a widely known mineral, there are some synonyms that can be used interchangeably with this word. These synonyms include Sodium Carbonate Decahydrate, Natron Salz, carbonic acid, and sodium salt. It can be found in areas with high geothermal activity, such as some areas in Iceland and Italy. Despite being a highly soluble mineral, it has some significant uses such as in glass and soap-making industries.