52 SILVER. 2. Auriferous Native Silver. Guldisches gediegen Silber, Werner. Id. Werner, Pabst. b. i. s. 12. Id. Estner, b. iii. s. 315. Id. Emm. b. ii. s. 154.—L’Argent natif aurifere, Brock, t. ii. p. 114.—Guldisch Silber, Ilcuss, b. iii. s. 322. Id. Lud. b. i. s. 210. Id. Suck. 2ter th. s. 128. Id. Bert. s. 862. Id. Mohs, b. iii. s. 123. Id. Leonhard, Tabel. s. 53. Id. Karslen, Tabel. s. 60. Id. Haus. s. 69- External Characters. Its colour is intermediate between silver-white and brass-yellow. It occurs disseminated, in membranes, which are pretty thick, passing into plates, capillary, in leaves, and some times crystallised in cubes. Its specific gravity, on account of the quantity of gold which it contains, is greater than that of common native silver. In other characters, it agrees with the preceding species. Constituent Parts. Silver, - - 72.00 Gold, - - 28.00 10'>.00 Fordyce, Phil. Trans. 1779, p. 523. Geognostic and Geographic Situations. It occurs in veins in primitive rocks at Kongsberg in Norway ; at Rauris in Salzburg ; and at Schlaugenberg in Siberia. , 3. Antimonial