. "THERM"@en . . . "Thermonatrite - A type of Na carbonate sedimentary rock. Thermonatrite (Na2CO3.H2O) forms orthorhombic crystals and efflorescent crusts. British Geological Survey Research Report RR/99/03, section 3.3."@en . . "Thermonatrite"@en . "Thermonatrite"@en . "stable"@en .