Min. [Named in honor of L. J. Thénard, French chemist: see -ITE1.] Anhydrous sodium sulphate occurring in white or brown translucent crystals.
1843. Penny Cycl., XXIV. 310/2. Thenardite—(Anhydrous Sulphate of Soda)—occurs crystallized…. It is used in the preparation of carbonate of soda.
1868. Dana, Min., 616. The water exudes during winter from the bottom of a basin, and becoming concentrated in the summer season, deposits crystals of thenardite.
