64 silver; It is opaque, or translucent on the edges. The lustre of the streak is resinous. It is very soft. It is malleable. Specific gravity, 4.804. Chemical Characters, It is fusible before the flame of a candle : before the blowpipe, on charcoal, it is reducible to a metallic glo bule, giving out at the same time vapours of muriatic acid: when rubbed with a piece of moistened zinc, the surface becomes covered with a thin film of metallic sil ver. Constituent Parts. Silver, _ 67.75 Oxygen, 6.75 Muriatic Acid, 14.75 Oxide of Iron, 6.00 Alumina, . 1.75 Sulphuric Acid, 0.25 97.25 Loss, - 2.75 100.00 Klaproth, Beit. b. iv. s. 13. Geognostic Situation. It occurs in silver veins, and generally in their upper part. These veins traverse gneiss, mica-slate, clay-slate, grey-wacke, porphyry, and limestone, and contain, be sides the corneous silver-ore, the following metalliferous and