Min. [a. Swed. trona (1773), app. from Arabic ṭrōn, apocopate form of naṭrūn, NATRON, ad. Gr. νίτρον soda (Dozy).] Native hydrous sodium carbonate, found in various places in N. Africa and America.
1799. Kirwan, Geol. Ess., 497. The trona was not deprived of its water of crystallization.
1850. Ansted, Elem. Geol., Min., etc., § 371. Trona, Urao, Hydrous sesqui-carbonate of soda.
1866. Lawrence, trans. Cotta’s Rocks Class. (1878), 51. Trona … forms a crust on the ground on mountain slopes … in Peru.
