Min. [mod. (Nordenskiöld, 1878), f. Gr. θαυμάσι-ος wonderful, marvelous + -ITE1: so named ‘on account of its unusual composition.’] ‘A white, amorphous mineral composed of silicate, carbonate and sulphate of calcium, and water’ (Chester).
1881. in Watts, Dict. Chem., VIII. 1921.
