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614 FLTTOBIDES, CHIOBIDES, BEOMIDES, IODIDES. a 100, o ill, d oil. ad 90° o' dd' 60° o' oo' 70 32 dd 45 0 (figs. 619, 620.) Od 64 44 Forms and combinations, a, o, d, ao, ad. The faces a some times faintly striated parallel to their intersections with d. No cleavage observable. Fracture conchoidal... uneven, earthy. Transparent...translucent on the edges. Lustre waxy, inclin ing to adamantine. Pearl-grey, passing into various shades of blue and green, yellowish-white. Grows brown when exposed to light. Streak shining. Malleable and sectile. h = ro...l'6. Q- — 5‘55.. .6*60. Before the blowpipe melts very easily with ebullition, and is gradually reduced into a globule of silver in the inner flame. Is reduced when rubbed with water on iron or zinc. Soluble in ammonia, and crystallizes from the solution in octahedrons. AgCl, chlorine 24 - 74, silver 75'26. Analyses of kerate by Klaproth, corrected by Bammelsberg, a from Saxony, b from Guantahajo in Peru, c from Schlangen- berg in Siberia:— a bo Silver 67'75 76 68 Chlorine 27‘50 24 loss 32 Bed ox. iron .... 6’00 — — Alumina l p 75 — — Sulphuric acid . . . 0 4 25 — — In crystals, reniform, investing other substances and massive, in veins in the older rocks with some of the other ores of silver. Is found in considerable quantities at Catorce and Zacatecas in Mexico, Potosi in Peru, los Lodrillos near Copiapo in Chile; also at Schlangenberg near Kolywan in Siberia; in smaller quantities at Allemont in Dauphine, St. Marie Aux mines in Alsace, Huelgoet in Bretagne, Spain, at Kongsberg in Norway, Huel Mexico and Huel St. Vincent near Calstock in Cornwall. It was formerly abundant in the Saxon mining districts and in the Harz, but is now very scarce. When metallic silver is immersed for a considerable time in salt water, the surface is converted into chloride of silver. 445. EMBOL1TE.—Embolit; Breithaupt. Cubic. a loo, o in.