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COMMON NATRON. Sll First Subspecies. Common Natron. Gemeines Natron, Werner. Nitruro, Blin. Ilist. Nat. xxxi. 10. p. 46.—Alkali mineralc na tron, Wall. t. ii. p. 61.—Alkali fixe mineral, Rorni- de Lisle, t. i. p. 146.—Natiirliclies mineral alkali, Wid. s. 579- Na- tron, Kirw. vol. ii. p. 6. Id. Estner, b. iii. s. 18.—Naturliches mineral alkali, Emm. b. ii. s. 81.—Carbonate de Natron, Lam. t. i. p. 462.—Soudc carbonat6e, Haw/, t. ii. p. 373. 379- I,”Alkali mineral, ou lc Carbonate de Soudc, Broch. t. ii. p. 30. —Natron, Ileuss, b. iii. s. 4.—Naturliches Mineral Alkali, Lud. b. i. s. 176. Id. Such. V tli. s. 2. Id. Bert. s. 331. Id. Mo/is, b. ii. s. 254.—Gemeines Natron, Leonhard, Tabel. s. 44.—Soude carbonatee, Brong. t. i. p. 149-—Gemeines Natron, Karslcn, Tnbcl. s. 56—Soda, Ilaus. s. 120.—Car bonate of Soda, Kid, vol. ii. p. 4.—Soude carbonatee, Haw), Tabl. p. 21.—Gemeines Natron, Lens. b. ii. s. 960.—Natron, Aihin, p. I S3, External Characters. its colours are yellowish and greyish white; also smoke- grey and cream-yellow. When fresh, it is compact, sometimes granular, some times radiated *, vitreous and glistening, and more or less translucent: when weathered, it is in loose, dull, opaque parts. It has an alkaline taste. U 4 Chemical * The crystallization of Artificial Soda,-for that of Natural Soda has not been met with,—is an oblique octahedron, which Is either perfect, or truncated on the angles or edges of the common basis,