Trō'na, n.
n. [Of Egyptian or North African origin.] (Min.) A native sesqui-carbonate of soda, which usually occurs in crystals, or fibrous masses, of a vitreous luster, and a gray or yellowish-white color.
n. [Of Egyptian or North African origin.] (Min.) A native sesqui-carbonate of soda, which usually occurs in crystals, or fibrous masses, of a vitreous luster, and a gray or yellowish-white color.