248 SILVER. 



sulfure, Hauy, in, p. 398-402; Drang, ii. p. 251; Compact 

 Silver-glance, Jameson, iii. p. 68. — This is one of the most fre- 

 quent of ores of silver. It is of a dark lead grey colour, often with 

 an irridescent tarnish. It is found crystalized, and in amorphous 

 masses ; also disseminated, in plates, dentiform, capillary, reticu- 

 lated, dendritical, stalactitic, and in leaves. The crystals are 

 cubes, octahedrons, rhomboidal dodecahedrons, double eight- sided 

 pyramids, or three and six-sided tables. The fracture is fine 

 grained and uneven, with a more or less shining lustre. It is 

 soft, very malleable, and flexible, but not elastic. Its specific 

 gravity is from 5*7 to 6*1. Before the blow-pipe the sulphur is 

 volatalized, and a globule of pure silver remains. According to 

 Klaproth its constituents are, silver 85, sulphur 15. Sulphuretted 

 silver occurs in veins traversing primitive and transition rocks, in 

 the Hartz, Saxony, Bohemia, and other mining districts on the 

 continent. It is also met with in small quantities in Cornwall 

 and America. It is very common in the mines of Mexico and Peru, 



Sp. 5. Brittle Silver Glance. — Sprod Glaserz; Werner. 

 Argent antimonie sulfure noir, Hauy. Rhomboidal Silver Glance, 

 Jameson. — The colour of this species of dark-lead grey, passing 

 into iron-black. It occurs massive, disseminated in thin plates, 

 and also crystalized. The primitive form is a rhomboid ; the 

 secondary figures, an equiangular six-sided prism, an equiangular 

 six-sided table, and a double six-sided pyramid. It is soft and 

 brittle. The fracture is somewhat conchoidal or uneven ; and the 

 lustre splendent and metallic. The specific gravity is 5*7 to 6*1. 

 Before the blow-pipe it melts, the sulphur, antimony, and arsenic 

 are driven off, and there remains a globule of silver, surrounded 

 by a slag. According to Klaproth, ' it contains, silver 66, sulphur 

 12, antimony 10, iron 5, copper and arsenic 0.50, earthly matter 

 1. It occurs in veins, principally in gneiss and clay-slate, in 

 various mines of Hungary, Saxony, Bohemia, Siberia, Mexico, 

 and Peru. 



Sp. 6. Red or Ruby Silver. PI. XXIII. fig. 2.— Sprod Glaserz, 

 Werner ; Argent antimonie sulfure, Hauy ; Argent rouge, Brong. 

 i. p. 254 ; Red Silver Ore, Jameson, iii. p. 78. — It is divided by 

 Werner into two sub species, or varieties, dark red silver ore, and 



